Australian Adtech and Martech: Growth,
Regulation, and Emerging Investor Risk

Australia's digital advertising market expanded steadily through the 2010s, but the post-pandemic acceleration changed the sector's scale and complexity. Total digital ad spend reached AUD $14.8 billion in 2023, then jumped to $16.4 billion in 2024 (up 11.1%) and $18.4 billion in 2025 (up 11.5%). [IAB Australia / PwC] This growth was driven by video, search, and — most recently — retail media, which expanded 27.1% in 2025 to reach approximately AUD $2.2 billion. [Meltwater / We Are Social] The programmatic supply chain underpinning this growth became increasingly concentrated in Google and Meta, a structural dependency that regulators eventually could not ignore.

The regulatory response began in earnest with the ACCC's Digital Platforms Inquiry in 2019, which first identified ad tech as a competition risk. The Digital Platforms Services Inquiry (DPSI) followed, running through to its final report published 23 June 2025. [Clifford Chance] That report contained 35 recommendations and explicitly named ad tech services as the first priority for designation under the proposed Digital Competition Regime — ahead of search, social media, and messaging. Treasury consultations on ad tech designation closed 14 February 2025, and draft unfair trading practices legislation was released in February 2026. [Clifford Chance] Separately, Apple and Google faced Federal Court remedies hearings on 30 March 2026 over app store overcharges, a proceeding with indirect consequences for ad-supported app monetisation. [ppc.land]

The ACCC's 2026-27 compliance and enforcement priorities, announced 19 February 2026, formalised its focus on dark patterns, fake pricing, and digital market power — three issues that sit squarely in the AdTech and MarTech operating environment. [ppc.land] This sequence — market growth, structural concentration, regulatory inquiry, enforcement action — mirrors patterns seen in the EU and UK, where similar trajectories eventually produced binding obligations on programmatic intermediaries. Australia is roughly four to five years behind the EU's Digital Markets Act timeline, but the legislative direction is now unambiguous.

The Australian digital advertising supply chain has four distinct actor groups. Global platforms — primarily Google (Search, Display, YouTube) and Meta (Facebook, Instagram) — capture the largest share of the $18.4 billion market, though neither discloses Australia-specific revenue. [IAB Australia / PwC] Australian classified platforms REA Group and Domain Holdings together dominate the $2.9 billion classifieds segment, with REA Group holding the larger share in real estate. [IAB Australia / PwC] Retail media operators — Woolworths' Cartology and Coles' Coles 360 — are the fastest-growing domestic actors, having entered the programmatic ecosystem as first-party data holders with direct advertiser relationships.

The ACCC sits at the centre of the regulatory actor map. Its 2026-27 enforcement priorities, announced February 2026, explicitly target digital market power, dark patterns, and fake pricing — three areas where AdTech and MarTech platform behaviour intersects with consumer law. [ppc.land] Treasury is the legislative actor: it ran the DPSI consultation, received the June 2025 final report, and released draft unfair trading legislation in February 2026. [Clifford Chance] The Office of the Australian Information Commissioner (OAIC) administers the Privacy Act, the reform of which would directly affect data handling requirements for AdTech operators using behavioural targeting. No specific Privacy Act amendment bill had passed Parliament as of Q1 2026.

Advertisers and agencies — including the major holding groups (WPP, Publicis, Omnicom, IPG) operating in Australia — are indirect stakeholders. They depend on the programmatic infrastructure Google and Meta provide but face their own compliance obligations if unfair trading prohibitions apply to the campaigns they run. The Interactive Advertising Bureau (IAB Australia) acts as the industry body, publishing the market expenditure data that defines this sector's public record and engaging in regulatory consultations on behalf of members.

The first and most consequential debate is whether ad tech services should be formally 'designated' under the Digital Competition Regime — a status that would allow the ACCC to impose mandatory codes on anti-competitive self-preferencing, data barriers, and programmatic transparency. [Clifford Chance] The DPSI explicitly recommended designation, making it the first priority after app marketplaces. The industry argument against designation is that the Australian market is too small for platform-specific obligations that could prompt Google and Meta to withdraw or reduce services — an argument the ACCC has consistently rejected. The counter-argument is that without designation, the programmatic supply chain remains opaque and advertisers continue paying inflated rates for inventory they cannot audit.

The second debate concerns the Privacy Act reform timeline. The OAIC administers a Privacy Act that was designed before behavioural targeting existed at scale. Proposed reforms — including stronger consent requirements and data minimisation obligations — would directly affect how AdTech operators collect and process the signals that underpin programmatic targeting. As of Q1 2026, no amendment bill had passed Parliament, but the reform trajectory is established. The industry is split: larger operators with first-party data advantages (retail media networks, classified platforms) favour strong consent requirements because they create barriers for competitors relying on third-party data. [ppc.land]

The third debate is about AI-generated content in advertising. Fewer than 35% of marketers globally planned to increase investment in AI governance or brand integrity oversight in 2026, according to StackAdapt survey data. [StackAdapt] The ACCC documented 1,000% growth in AI-generated fake reviews between 2022 and 2025, signalling that AI-enabled deception has moved from hypothetical to active enforcement territory. [ppc.land] Consumer trust in AI-generated advertising fell from 60% (2023) to 46% (2024). [StackAdapt] The fourth debate — less visible but structurally important — is about who bears the cost of the redundancy and workforce restructuring that AI is driving through marketing departments, with Australian CMOs publicly flagging a redundancy crisis in 2025. [B&T]

The strongest evidence in this briefing covers market size and growth. IAB Australia publishes a quarterly Online Advertising Expenditure Report produced with PwC — a Tier 1 methodology with mandatory member participation. The 2025 figures (AUD $18.4 billion total, $5.4 billion video, $8 billion search) are the most reliable data points in the Australian digital advertising landscape. [IAB Australia / PwC] Market forecasts from WPP Media and Mediaweek are Tier 2 — credible but projections, not measurements. [Mediaweek]

The regulatory evidence is structurally weaker. The DPSI final report is a primary government document, but it is available only through secondary legal analysis (Clifford Chance, Wolters Kluwer competition blog) rather than direct citation. [Clifford Chance] ACCC enforcement actions against Microsoft and JustAnswer are reported through Tier 3 trade sources (ppc.land) rather than primary ACCC press releases. This does not mean the events are wrong — the reporting is specific and detailed — but it means verification would require direct ACCC database access not included in the research base. No ASX filings, earnings calls, or investor disclosures from named Australian AdTech or MarTech companies were found. This is the critical evidence gap: the sector's financial exposure to regulatory risk cannot be quantified from publicly available data.

The AI and consumer trust data comes entirely from StackAdapt, a programmatic advertising platform with a commercial interest in shaping how the market perceives AI risk. The figures — 46% consumer trust in AI ads, fewer than 35% of marketers increasing AI governance investment — are plausible and directionally consistent with global surveys, but they are a single Tier 3 source. [StackAdapt] The ACCC's own AI fake review data (1,000% growth, 2022–2025) is more credible but sourced through secondary reporting. [ppc.land] Readers should treat the qualitative regulatory direction as well-established and the quantitative company-level risk as genuinely unknown.

The most common misconception among investors and operators is that Australian digital advertising regulation is nascent and years away from material impact. The evidence contradicts this directly. The ACCC already has active Federal Court proceedings against Microsoft (October 2025) and JustAnswer (September 2025) for conduct that includes the dark patterns and subscription traps that MarTech platforms routinely enable. [ppc.land] The DPSI has made its recommendations. Treasury has released draft legislation. The designation process for ad tech has a closed consultation (February 2025). This is not a threat on the horizon — it is a legislative process in its final stages.

A second misconception is that cookie deprecation is no longer a material risk because Google has repeatedly delayed its timeline. The structural shift away from third-party cookies is occurring regardless of Google's Chrome timeline — Safari and Firefox already block third-party cookies by default, covering a meaningful share of Australian browsers. [Research — no specific Australian browser share data found; general consensus position] Australian operators without first-party data infrastructure are not protected by Google's delays. A third misconception is that the classifieds duopoly (REA Group and Domain Holdings) is insulated from structural disruption. Classifieds grew only 5% in 2025 — the slowest of all major digital ad segments — while retail media grew 27.1%. [IAB Australia / PwC] The transition of advertiser budgets toward closed, first-party retail media environments is a direct competitive threat to open classifieds inventory.

A fourth misconception is that AI's impact on the sector is primarily a workforce story. The ACCC's documentation of 1,000% growth in AI-generated fake reviews between 2022 and 2025 shows that AI is already a supply-chain integrity problem, not just a labour market disruption. [ppc.land] If AI-generated inventory becomes pervasive in programmatic auctions, the verification and brand safety infrastructure that advertisers pay for will need to be rebuilt. Fifth, the assumption that Australia will regulate differently from the EU because of its smaller market size is contradicted by the DPSI's explicit adoption of EU Digital Markets Act concepts — designation, mandatory codes, interoperability obligations — as the framework for Australian reform. [Clifford Chance]

The EU's Digital Markets Act provides the most directly comparable precedent. The European Commission began formal ad tech investigations in 2021, published the DMA in 2022, and began applying it to designated gatekeepers (including Google and Meta) in March 2024. [Clifford Chance] The time from first formal investigation to binding obligations was approximately three years. Australia's ACCC began its first Digital Platforms Inquiry in 2019; the DPSI concluded in June 2025. If the EU timeline holds, Australia should see binding ad tech obligations by 2026-2027 — which is precisely what the current legislative pipeline projects.

The UK's Competition and Markets Authority (CMA) followed a similar arc. Its online platforms and digital advertising market study ran from 2019 to 2020, leading to the Digital Markets, Competition and Consumers Act (DMCCA) receiving Royal Assent in May 2024. The DMCCA creates a Strategic Market Status (SMS) designation process directly analogous to Australia's proposed Digital Competition Regime. [Wolters Kluwer competition blog] Critically, the UK's SMS regime applies to individual activities — meaning Google's search advertising could be designated separately from its programmatic advertising, allowing targeted obligations rather than blanket platform regulation. Australia's DPSI recommended a similar activity-specific approach.

Canada's digital advertising market provides a cautionary precedent on enforcement delay. The Competition Bureau of Canada launched a market study in 2020 but has yet to produce binding ad tech obligations as of Q1 2026 — a gap attributable to slower legislative reform rather than absence of market concern. The Canadian experience suggests that inquiry and enforcement can decouple if legislative momentum stalls. In Australia, the difference is the DPSI's explicit ad tech designation priority and Treasury's active draft legislation — both of which reduce the probability of the Canadian outcome. The South Korean KFTC's enforcement against Google's Play Store in 2021, resulting in mandatory payment system openness, demonstrates that even mid-sized markets can impose material structural obligations on global platforms when regulatory will is present.

The most certain near-term development is the progression of Treasury's Digital Competition Regime legislation. Draft unfair trading legislation was released in February 2026; ad tech designation consultation closed in February 2025. If the legislative calendar holds, a formal designation decision on ad tech services is the most probable outcome by end-2026 or Q1 2027. [Clifford Chance] Once designated, platforms face ACCC-imposed mandatory codes — the precise scope of which will be negotiated but is expected to cover programmatic transparency, data access, and self-preferencing restrictions. This is the highest-impact development for the sector and the one with the clearest legislative precedent.

Retail media will continue taking share from open programmatic and classifieds. The 27.1% growth in retail media versus 5% in classifieds and 1.9% in display (ex-video) is not a one-year anomaly — it reflects the structural advantage of first-party, purchase-intent data in a cookie-constrained environment. [IAB Australia / PwC] [Meltwater / We Are Social] By 2027, retail media networks run by Woolworths, Coles, and potentially Amazon Australia will have the data infrastructure to compete directly with Google Display for mid-funnel FMCG advertising budgets. This is a structural market shift, not a cyclical one. Total market spend is forecast to reach AUD $30.7 billion by end-2026 [Mediaweek], sustaining the tailwind even as share shifts between channels.

AI-generated content fraud will become a material programmatic supply chain problem by 2027 if the ACCC's 1,000% growth in AI-generated fake reviews (2022–2025) continues at any fraction of that pace. [ppc.land] The verification infrastructure — brand safety tools, invalid traffic detection, contextual classification — was built for human-generated content at human-generation speeds. AI changes both the volume and the sophistication of fraudulent inventory. The ACCC has signalled this as an active enforcement area; the question is whether it pursues AdTech platforms as enablers or restricts action to the direct perpetrators. The answer will define the compliance obligations of every DSP and SSP operating in Australia.

The base case — a 55% probability — is that Treasury finalises the Digital Competition Regime, ad tech services are formally designated by end-2026 or Q1 2027, and the ACCC begins a mandatory code development process. [Clifford Chance] Under this scenario, the market continues growing (total digital ad spend reaches AUD $20–22 billion by end-2027), but compliance costs rise for programmatic intermediaries. Google and Meta adapt rather than withdraw — as they did in the EU — and Australian operators with strong first-party data positions (REA Group, retail media networks) gain relative advantage. The unfair trading legislation also passes, creating a new enforcement mechanism that the ACCC uses selectively against the most egregious dark pattern practices.

The upside scenario — a 20% probability — is that legislative delays push formal ad tech designation past 2027, giving the market an extended period of growth without structural regulatory obligation. This is the Canadian outcome: inquiry without binding enforcement. [Wolters Kluwer competition blog] In this scenario, the programmatic supply chain remains opaque, retail media continues to grow, and investors in open programmatic platforms face a benign regulatory environment for longer than expected. The risk is that this scenario ends abruptly when enforcement finally arrives — with less time for operators to adapt.

The downside scenario — a 25% probability — is an accelerated enforcement sequence where Federal Court proceedings against a named AdTech platform (most likely a DSP or SSP engaged in programmatic fraud or undisclosed self-preferencing) become the catalyst for emergency legislative action. The ACCC has the enforcement tools and the stated 2026-27 priorities to pursue this path. [ppc.land] Under this scenario, a single large enforcement action creates a chilling effect on programmatic investment, advertisers accelerate their shift to walled gardens and retail media, and mid-tier Australian AdTech operators face structural pressure they cannot absorb within a 12-month adjustment window. The 1,000% growth in AI-generated fake reviews is the most plausible trigger: if the ACCC names a platform as an enabler of fraudulent AI inventory, the sector's risk premium re-prices overnight.