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Google's target-based bidding change took effect on August 17. Campaigns limited by budget and running Target CPA or Target ROAS now deliver closer to the number the advertiser entered instead of beating it. Google's own documentation uses a $10 target CPA that has been coming in at $5, which after the change should land nearer $10. Performance Max and Demand Gen accounts may also see traffic redistribute across channels. App campaigns, video reach and video view campaigns keep the old behavior.

Google gave months of notice, built a Bid Target Adjustment Tool and pushed a notification to every account that had run a budget-limited target campaign at any point in the previous twelve months. The advertisers who got hurt got hurt because they had been reading the target as a ceiling the system would try to beat, when it has always functioned as a stated willingness to pay. A bidder authorized to spend $10 per conversion is under no obligation to keep returning $5. That difference goes somewhere, usually into volume nobody asked for at a price the advertiser already said was acceptable.

Toni Poulain of Goodway Group made the structural version of the argument in AdExchanger on 31 August, which is that the platform's optimizer was never a neutral employee of the advertiser given who sets the auction rules and who grades the results. She reads Meta's most recent quarter as evidence of the pressure sitting behind decisions like this one, with revenue up 28% year over year, costs up 55%, free cash flow down 91%, and full-year capex guidance raised to $130B to $145B. Advertising is the business paying for the AI buildout at all of these companies, and it has been asked to pay more this year than last. Her conclusion is that agencies are the answer, which is convenient for an agency executive to reach and does not damage the underlying read. Her figures broadly track the Meta filing.

None of this requires bad faith from Google. The company built the marketplace and earns more when advertisers spend more, and it has said in public that it believes consistent delivery against a stated target serves advertisers better than unpredictable overperformance does.

The same architecture is being sold into commerce right now. Agentic checkout and the transaction protocols being built so a shopping agent can buy on a customer's behalf rest on the same request, which is that the merchant states a goal and lets somebody else's system execute against it. Merchants signing up for that will eventually have to answer the question Google just answered for advertisers, about what the system does when its economics and theirs stop pointing the same direction.

The accounts that came through 17 August without damage had somebody reading release notes and holding a performance baseline that did not come from the platform being measured.

That is an expensive person to keep and an easy one to cut while the interface keeps getting simpler. Most of the agentic roadmap, in advertising and in commerce, is priced on the assumption that the job goes away.

Amazon has spent most of a decade running creator commerce on its own property, where influencer storefronts and custom tracking links kept the customer relationship inside Amazon from the first click through to the reorder. Neal Mohan said on X on August 27 that Amazon has joined the YouTube Shopping affiliate program. Eligible creators can tag Amazon listings inside videos, Shorts and livestreams and collect commission on what sells.

YouTube says more than a million people have signed up for YouTube Shopping since it dropped the subscriber threshold in March. The affiliate program has opened in Argentina, Mexico and the UK.

Amazon built two decades of margin on the assumption that product search starts at Amazon, and paying commission to a reviewer is what it looks like when that assumption stops holding. Owning the checkout at the end of a long review is worth more than defending a search impression that never loads.

For brands running their own affiliate programs, the comparison a creator makes is conversion rate, and Amazon wins it. The tagged link routes the sale to Amazon along with the purchase data and whatever the reorder behavior turns into.

Amazon resisted this for years. Nothing YouTube announced in March looks big enough on its own to explain why it stopped