Google Ad Manager gives you demand access nobody else can match. It is also the ad server a US court found to be an unlawful monopoly. Both of those are true at once, and choosing well means holding both.
Google Ad Manager is the largest and most widely used ad server in the world, and its advantage is not the software — it is the demand. Through Google Ads and DV360 it reaches buyers no independent platform can assemble, including a long tail of advertisers who exist nowhere else.
For many publishers, Google demand is not one source among several. It is the majority of revenue. Any honest conversation about replacing GAM has to start by asking what happens to that.
This is a live legal matter, so it is worth separating what is settled from what is not.
Judge Leonie Brinkema of the US District Court for the Eastern District of Virginia found that Google unlawfully monopolized two markets: publisher ad servers and ad exchanges. The court further found that Google illegally tied AdX, its exchange, to DFP, its publisher ad server — and that this tying helped maintain the monopoly to the detriment of publishers' interests.
That is a finding of fact and law by a court, not an allegation.
The remedies phase concluded with closing arguments in November 2025. At the time of writing, a final remedy decision had not been issued.
A separate European Commission proceeding on self-preferencing in ad tech has also been moving toward structural remedies.
Verified August 2026 from AdExchanger on the AdX and DFP divestiture debate, Digiday's explainer on the remedy phase, and The Current on the judge's questioning of structural remedies. This is an active proceeding and the position may have changed since publication — check the current status before relying on anything here.
The point is not that you should leave Google Ad Manager. Millions of publishers will not, and for many that is rational. The point is that a specific risk you could previously ignore is now on the table.
You do not have to choose between Google demand and independence. Running a second ad server on a slice of inventory, or adding independent demand into your existing stack, means you have a tested alternative if the landscape shifts. That costs very little and it is what we would advise even if we were not selling one.
| Dimension | Google Ad Manager | GoGo CTV |
|---|---|---|
| Owner | Independent | |
| Owns competing demand | Yes — Google Ads and DV360 are the largest buyers in the market | No |
| Demand access | Unmatched. This is the reason to use it | Your own direct and programmatic partners, plus optional curated demand that competes on price |
| Scope | Web, app, video and streaming in one platform | Streaming only — CTV, OTT, FAST, VOD |
| Regulatory position | Subject to a US monopolization finding covering publisher ad servers and ad exchanges; remedies pending as of August 2026 | Not subject to any such proceeding |
| Commercial model | Not published in a comparable form; bundled with demand | Software licence. No percentage of media |
| Operating history | The longest in the industry, at the largest scale | Shorter. We are the newer entrant |
Google Ad Manager rows reflect public information and court reporting as of August 2026 and are not legal advice or a substitute for your own diligence. Commercial terms are negotiated and rarely published — including ours. Performance figures on our product page are internally measured, not audited.
For most publishers on Google Ad Manager, a full replacement is not the right first step and we would not propose one. Two lower-risk options:
GoGo CTV can compete as a demand source in your current auction over OpenRTB or Prebid Server. Nothing migrates; you find out whether we bid competitively on your inventory. See server-side bidding.
A shadow test followed by a small parallel run on CTV inventory only. You keep Google demand where it performs and build a tested alternative in the place where an independent is most likely to win — connected TV.
A shadow test on a slice of your CTV inventory costs you nothing and tells you exactly what an independent path would be worth.