On September 16, Judge Leonie Brinkema unsealed a 106-page remedies opinion in the Google ad tech antitrust case. No divestiture. No breakup. The DOJ asked the court to force Google to sell AdX. The court said no.
Instead: behavioral remedies. Google must build API integrations connecting AdX and DFP to Prebid. Must submit AdX bids to rival publisher ad servers on the same terms as DFP. Must share real-time win-and-loss bid data with publishers. Must let publishers export their own data. A six-year technical monitor with full access to Google's employees, systems, and source code. Twelve to fifteen months to implement.
This is the most significant structural intervention in the publisher ad tech stack in a decade. If you're a large publisher running GAM, you will — eventually — be able to route demand through Prebid without Google's thumb on the scale. Rival exchanges like Index Exchange, PubMatic, and OpenX get meaningfully fairer access. The playing field tilts, slightly, toward competition.
And none of it matters the way it would have mattered three years ago.
The Scope
The ruling applies to open web display advertising. Not video. Not connected TV. Not in-app. Not retail media. The DOJ tried to extend restrictions to DV360 — Google's demand-side platform, which ran Project Poirot, the 2017 program that systematically cut bids on rival exchanges by up to 90%. Brinkema said the government hadn't proven DV360's role in court. It walks free.
And the entire agentic advertising stack — MCP servers, AAMP registries, AI-mediated buying — doesn't appear once in 106 pages. It didn't exist when the case was filed. The remedies regulate the infrastructure of 2019. The industry is building the infrastructure of 2028.
What It Means for People Inc
At first glance, this is good news. D/Cipher runs on Google Ad Manager. The Prebid mandate means D/Cipher's supply path becomes marginally less dependent on Google's internal routing. Rival exchanges get fairer access. Bid transparency increases. The publisher ad server market inches toward competition.
But look at where the business is actually moving.
At the Goldman Sachs Communacopia conference on September 9, Neil Vogel described a company that has spent five years deliberately shrinking the surface this ruling regulates. Google's share of People Inc's traffic: down from 70% to 20%. Non-session revenue — Apple News, AI licensing, social distribution, events, D/Cipher's direct deals — now 40% of digital revenue, growing at 16%. Session-based revenue, the thing most exposed to open web display dynamics: declining 1%, despite a 22% drop in sessions.
The ruling fixes plumbing in a room the company is walking out of.
The Irony
People Inc spent five years reducing Google dependency. The court just ordered the industry to make Google dependency less harmful. Both arrived at roughly the same destination — a less Google-concentrated supply path — through completely different mechanisms. One took five years of execution; the other will take 12 to 15 months of court-supervised implementation, followed by whatever Google's compliance looks like under a monitor with six years and full source code access.
The publishers who benefit most from this ruling are the ones who didn't do what People Inc did: the ones still running 60-70% of their revenue through GAM with no alternative supply path. For them, forced Prebid integration is a lifeline. For People Inc, it's confirmation that the exit they've been building works.
What the Ruling Doesn't Fix
D/Cipher's competitive gap is not a Google dependency problem. It's a protocol adoption problem. Seventeen ad-campaign MCP servers existed as of late July. Amazon's AAMP 3.0 has production Seller SDKs. PMG integrated AAMP into its buying platform. Adform committed to AAMP standards. ChatGPT's ad product reached 51% of US replies with self-serve CPC auctions.
None of that is in Brinkema's 106 pages. None of it could be. The case was about the ad tech market that existed. The competitive pressure on D/Cipher comes from the ad tech market being created.
Forced Prebid integration even creates a subtle new question. If the industry's open-web-display plumbing becomes more interoperable by court order, does that make D/Cipher's proprietary intelligence more valuable (because the supply path is now cleaner) or less relevant (because the competitive surface is shifting to agent-mediated buying where D/Cipher has no presence)?
The Stock Doesn't Care
PPLI closed at $38.05 on September 18 — 21% below the $48.30 MGM bid price. The ruling unsealed two days earlier. The stock didn't move on it. The market is pricing the MGM deal, the balance sheet, the macro — not whether Google's ad exchange plays fair with Prebid. The six analysts who raised their price targets (average $56.55, one at $70) did so on Q2 earnings and guidance, not ad tech jurisprudence.
This is the final indignity of a landmark ruling. The biggest publisher ad tech case in a generation resolved, and the company most structurally positioned to benefit from it has a stock price that noticed nothing. Because the stock isn't trading on the open web display ad stack. It's trading on whether Barry Diller can close an $18 billion casino deal at a price no one currently believes.
One hundred and six pages to regulate a shrinking perimeter. The remedy arrived. The disease moved.
Sources: AdExchanger, Digiday, Seeking Alpha (Goldman Sachs Communacopia transcript), Lawyer Monthly. Ruling: U.S. District Court, Eastern District of Virginia, United States v. Google LLC, Case No. 1:23-cv-108 (LMB/JFA), unsealed September 16, 2026.