The story. Judge Leonie Brinkema’s remedies now carry a build clock, not just a mandate: Google has 12 months to open AdX to rival ad servers and 12–15 months to connect AdX and DFP to Prebid, with 15 months as the deadline for the full judgment to be implemented. What the clock does not touch is just as load-bearing for a GAM operator: DV360 stays unregulated, there’s no breakup, and the remedies apply only to the open-web display auction — not CTV, in-app, or retail media, the three categories actually growing. (Digiday, “Google’s ad tech remedies decoded: what changes, what doesn’t and what will take years,” 17 September 2026)
01What happened
- The build deadlines are now specific. Google has 12 months to open AdX to competing ad servers on non-preferential terms, and 12–15 months to wire AdX and DFP into Prebid — the same interoperability mandate covered when the opinion first unsealed, now with an actual implementation clock attached.
- The remedies target a shrinking pool. AdWords’ share of traditional open-web display impressions fell from more than 40% in 2019 to 11% by 2025, per the trial record — meaning the auction mechanics being fixed sit in the segment of the market that’s already contracting, not the ones expanding underneath it.
- DV360 and the growth categories are out of scope. The court found insufficient evidence to regulate DV360, and the remedies don’t reach CTV, in-app, or retail media programmatic — all three are where ad tech’s volume has actually been moving.
- Enforcement has real but slow teeth. The court-appointed monitor reports on compliance every three months rather than continuously, and Digiday reports Google gets a response window of more than a month before the judge can act on a flagged violation — privacy expert Alan Chapell’s read is that Google is “brilliant at playing the behavioral remedies game,” warning publishers should expect “breadcrumbs,” not structural change.
- A bypass path already exists. Google Partner Bidding (gBid Direct) lets Google bid directly into publisher in-app auctions without going through an exchange at all — the court flagged it as a template Google could extend to open-web display once the new Prebid and AdX-opening requirements bite.
02What it means inside a GAM network
How the final DOJ remedies reshape GAM/AdX separation timelines and sell-side curation economics — what operators execute now vs. what gets extended.
The 12-month AdX-opening deadline and the 12–15 month Prebid integration window are the two dates worth putting on your own roadmap, because they’re the first remedies with an actual build-and-test period attached rather than an open-ended mandate. But the scope exclusion matters just as much as the timeline: if CTV, in-app, and retail media programmatic sit outside these remedies, a publisher’s non-display inventory sees none of the interoperability benefit the open-web display auction is about to get. That’s a real argument for treating this as a display-specific fix, not a signal that curation and separation pressure is coming to the rest of your stack on the same clock — plan the AdX/Prebid transition on its own timeline, and don’t assume CTV yield mechanics inherit any of it.
The remedies opinion has gone from "what Brinkema ordered" to "what Google has to ship and by when" — 12 months to open AdX, 12 to 15 to wire in Prebid.
03What publishers should do about it
04The bottom line
The remedies opinion has gone from “what Brinkema ordered” to “what Google has to ship and by when” — 12 months to open AdX, 12 to 15 to wire in Prebid. But the deadlines only cover a shrinking slice of the market: DV360, CTV, in-app, and retail media are untouched, and the enforcement cadence (quarterly monitor reports, a month-plus response window before the judge can act) gives Google real room to manage the pace of compliance. For a GAM operator, the clock is real; the scope is narrower than the headline suggests.