The monopoly ruling that changes nothing.

A Senior Marketing friend of mine pinged me this week wanting to know what Wednesday’s Google ad tech ruling actually changes for her media plan. The honest answer is nothing, not yet, because the ruling itself is only half public.

Judge Brinkema found Google’s ad tech stack an illegal monopoly back in April 2025. This week she ruled on the remedy, and turned down every structural fix the Department of Justice asked for: no forced sale of the AdX exchange, no opening up the auction logic locked inside DFP, no split-off of what’s left. Instead she accepted most of the behavioural remedies both sides had proposed, reshaped where she saw fit. What those remedies actually require isn’t public yet. Redactions are due 16 September; the final judgment isn’t due until 2 October. Nobody buying media through that stack knows the operative rules today.

That’s the part worth noting. A court can name a monopoly and still change nothing about who owns the trade on both sides of it, this month, next month, or the month after the judgment lands. Waiting on this ruling to settle your adtech concentration risk was never quite the right posture, and a sealed month ahead makes that plain. The stack you buy through today is the stack you’ll still be buying through once the redactions clear, and likely the one after that too.

A judgment landing in October doesn’t change who owns the exposure between now and then. The stack stays exactly what it is until someone inside your organisation decides to own that risk.