Prebid Proposes Ad Server Bid into Platform, Unbundling GAM
At the Prebid Summit in New York City on October 13, industry leaders discussed programmatic advertising's future, including challenges from Apple's iOS 27 and critiques of universal buying platforms. Alan Chapell predicted Google would 'claw back' antitrust remedies, Terry Kawaja likened UMPs to ad networks, and Ian Meyers highlighted transparency issues. Prebid proposed a new auction model to eliminate Google's alleged advantage: publisher ad servers would join the Prebid Server auction, bringing AdX into the same bidding process as other SSPs earlier, rather than competing later within GAM. This aims to reduce publisher reliance on Google Ad Manager and halve auction response time. The proposal, in public comment, targets formalization by Q1 2027, but implementation depends on whether Google uses Prebid.js or Prebid Server. Separately, Treasure AI transitioned from a CDP to an Agentic Experience Platform, though marketers' 'honeymoon phase' with AI agents is fading. Additionally, Google launched optional channel prioritization controls for advertisers on October 14.