Daily Pulse · March 16, 2026 · 3 signals
Infrastructure Before Inventory
The AI ad stack isn't a future state – it's being wired now.
ChatGPT Has Ads. Criteo Is the Infrastructure. That's the Real Signal.
Change
OpenAI routed ChatGPT ads through Criteo's infrastructure
→ The plumbing is decided – and so is who controls the fee structure
Why it mattersAd access runs through existing DSP pipelines, not OpenAI direct
$60
Estimated ChatGPT CPM
5%
ChatGPT mobile users w/ ads
17k
Advertisers via Criteo
ChatGPT ads launched in the US on February 9 for Free and Go plan users. As of March 16, they reach approximately 5% of ChatGPT mobile users – up from 1% at the start of the month. The CPM sits at roughly $60, approximately 3x standard Meta rates and on par with Netflix's ad tier. Pilot window runs through end of March.
The architecture matters more than the rollout pace. Criteo joined the OpenAI advertising pilot on March 2 as the first ad-tech partner – providing access to its 17,000-advertiser network and $4B+ annual media spend. That means ChatGPT ad inventory is accessible through Criteo's commerce-intent data infrastructure and existing buyer relationships, not through a new OpenAI-direct sales process.
OpenAI's choice not to build its own ad stack – and to instead borrow Criteo's merchant catalog and programmatic pipelines – is a structural decision about where the ad buying relationship lives. Criteo is the gateway. The buyers who access it first are Criteo's existing clients.
▲ Wins
Criteo – positioned as the infrastructure gateway to OpenAI's ad stack for 17,000 existing advertisers, extending its own relevance into the AI platform layer. Mid-market buyers who can't negotiate direct platform deals get ChatGPT access through pipelines they already use.
▼ Loses
Agencies that assumed a future direct OpenAI buying relationship would be a competitive differentiator. If ChatGPT inventory routes through Criteo, the intermediary is already decided – at Criteo's margins, under Criteo's data terms.
◆ Pulse Take
ChatGPT advertising at 5% user coverage and $60 CPM is not yet a channel. But Criteo as the infrastructure partner means the plumbing is already decided – and so is who controls the fee structure.
PMax Drives 62% of Google Ad Clicks. AI Brand Voice Will Run on All of Them.
Change
Google defaulted AI voice across 62% of its ad clicks
→ Inaction is the consent mechanism – agencies that didn't act let Google decide
Why it mattersBrand voice governance becomes unfunded agency overhead
62%
Google ad clicks via PMax
Mar 20
Opt-out deadline
1M+
Advertisers auto-enrolled
Google's AI voiceover feature reads existing ad copy from an advertiser's PMax asset group, synthesizes a voice track using Google's voice models, and layers it onto any video without an existing voice track – activating the result as a new asset without advertiser review. Opt-out is at the campaign level, not the account level. For large advertisers managing dozens of PMax campaigns across markets and brands, that means individual campaign audits before March 20.
The scale is the story. Performance Max now drives 62% of all Google ad clicks. A feature that auto-enrolls every eligible PMax campaign isn't a pilot – it's a simultaneous change to the creative defaults for the majority of Google's ad inventory. The opt-out deadline focuses attention on next Friday, but the real question is what happens after: every new PMax campaign starts with AI voiceover enabled by default.
▲ Wins
Small and mid-market advertisers who lacked audio production capacity – AI voiceover removes a real barrier to PMax video adoption. Google deepens its creative control layer across the largest share of its inventory.
▼ Loses
Enterprise agencies charging for brand voice governance. The campaign-level opt-out requirement means large accounts need perpetual per-campaign auditing – work with no new billing code. Brand managers who built creative approval workflows around audio assets.
◆ Pulse Take
This isn't about one voiceover feature – it's about what happens when 62% of Google's ad clicks run through a system that can add brand voice without asking. Agencies that didn't act before March 20 let the platform decide.
Publicis Revenue Up 8.5%. WPP Profit Down 71%. This Is What AI Divergence Looks Like.
Change
Publicis grew 8.5% while WPP profit collapsed 71%
→ The gap is structural, not cyclical – WPP can't cost-cut its way to parity
Why it mattersAI infrastructure separates winning from losing agencies
+8.5%
Publicis 2025 revenue growth
-71%
WPP pre-tax profit
€17.4B
Publicis total revenue
Publicis reported full-year 2025 revenue of €17.4B, up 8.5%, with connected media – AI-powered audience and creative optimization – representing 60% of net revenue at high single-digit organic growth. The company guided 4-5% organic growth for 2026, citing Omnicom-IPG merger disruption as a client acquisition tailwind.
WPP reported pre-tax profit of £98M for 2025, down 71% from the prior year. Operating profit fell 47.8%. New CEO Cindy Rose announced the Elevate28 restructuring plan, targeting return to growth in 2027 with £500M in annualized cost savings – framing the entire program as an AI transformation. The framing is correct: the problem is structural, not operational. WPP doesn't need to cut costs faster. It needs to own the data layer Publicis spent a decade building.
▲ Wins
Publicis – CEO Sadoun publicly stated the Omnicom-IPG merger disruption is pulling clients toward them. Brands that bet on AI-infrastructure agencies early are seeing the performance gap validate that decision.
▼ Loses
WPP and agencies without proprietary AI-scale data platforms. Mid-tier agencies that claim 'we use AI tools' but can't demonstrate a connected data advantage are now being compared to a €17.4B benchmark.
◆ Pulse Take
WPP's 71% profit collapse is the income statement of a legacy model losing to an AI-native competitor. Publicis's 8.5% growth shows what happens when AI infrastructure becomes a revenue generator – the gap is structural.
3 signals · March 16, 2026