A year and a half after a US district court found Google had illegally monopolized online advertising, the industry finally has a clearer view of the remedy: a code of conduct, not a breakup. Judge Leonie M. Brinkema’s full opinion, released this week, rejects a forced sale of Google’s ad exchange and instead imposes a package of behavioural rules that apply wherever Google’s ad tech operates.
The decision follows a remedies trial with 26 witnesses, and a September order that had already ruled out splitting the company. The underlying complaint came from the Department of Justice and 17 states more than three years ago.
What the remedies actually require
The court’s requirements fall into three buckets: open data access with rivals, bans on self-preferencing, and restrictions on auction gaming by Google’s buying tools.
- Google must let Prebid, the open-source auction layer many publishers already use, pull real-time bids from AdX.
- DfP, Google’s publisher ad server, gets the same interoperability treatment.
- An independent monitor will oversee compliance, funded by Google.
- The rules apply globally, not just in the United States.
For publishers, the headline win is that AdX demand would have to compete through neutral pipes rather than enjoying privileged access that rivals cannot see or verify. Some ad tech executives had argued this would force AdX to fight for inventory and put more money back into publisher yield.
Why the optimism is limited
Not everyone expects a meaningful shift. Privacy expert Alan Chapell, founder of Chapell and Associates, cautions that Google is skilled at working within behavioural remedies: it can attach conditions to AdX access, write narrow commitments that ban outdated self-preferencing, and lean on privacy tech that makes independent auditing harder. The risk, he says, is stronger-looking rules with only “breadcrumbs” of real competitive change.
The buy-side gap is another reason for skepticism. Judge Brinkema left DV360 untouched because the government did not prove it played the same role as AdWords in steering demand to AdX. AdWords itself was targeted, but critics say regulating auction access while leaving buy-side integration intact turns Google into a supervised utility rather than an open market.
An ad tech specialist who reviewed Google’s proposals told Digiday that the commitments are written to satisfy narrow legal promises, not to guarantee better publisher revenue. “The commitments…they do not say that there is going to be a market impact as a deliverable,” they said.
Timing, enforcement and scope
The rollout will be slow. Google has up to 12 months to open AdX to rival ad servers, and 12 to 15 months to connect AdX and DfP to Prebid. The judge expects the full judgment to be operational within 15 months, so publishers may not see revenue effects for more than a year.
Enforcement is also limited. The independent monitor reports every three months, not immediately when a problem appears, and Google gets a response window before the court can be approached. That is the slower version of oversight that many executives had warned would make penalties too late to matter.
The remedies target open-web display advertising only. They do not cover streaming TV, in-app or retail media. Google’s own data makes the timing awkward: AdWords ad impressions in traditional display fell from over 40% in 2019 to 11% in 2025, while other formats grew. The court also flagged Google Partner Bidding, or gBid Direct, as a workaround to watch because it already lets Google bid directly into in-app auctions and could extend to open-web display.
What marketing and media teams should watch
- Audit how much of your programmatic budget flows through open-web display versus channels outside the remedy’s scope.
- Track whether your ad server or SSP partners actually enable Prebid/AdX interoperability once the 12-month window closes.
- Review monitoring reports for evidence of compliance, but don’t assume rapid revenue gains.
- Keep an eye on gBid Direct and any move to bring direct bidding to display inventory.
For marketing leaders, the takeaway is not that Google is being dismantled. It is that the open-web display auction is becoming a regulated area with slow, narrow enforcement, while the fastest-growing media channels remain largely outside this fix.
Source: Digiday
