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This is less a market catalyst than a compliance-and-ad-tech microstructure update. The second-order effect is that opt-in defaults and consent friction continue to erode addressable inventory for performance advertising, which incrementally strengthens walled gardens and first-party data owners while pressuring open-web adtech, cookie-based attribution vendors, and smaller publishers reliant on remnant demand.

The economically important wrinkle is that privacy settings are sticky at the browser/device level, so even a modest increase in opt-out rates compounds over time into lower match rates and weaker measurement fidelity. That typically compresses ROAS for advertisers, which can cut budgets toward channels with cleaner identity graphs and better closed-loop data. In practice, this favors platforms with logged-in users and in-house measurement, while mid-cap adtech names face a longer-tail revenue mix shift rather than a one-day shock.

The contrarian angle is that this may be more of a margin and routing issue than a top-line collapse for the ecosystem. Advertisers rarely abandon spend; they reallocate to higher-certainty channels, meaning the losers are often the middlemen, not the demand side. The real risk is a slow grind: every incremental privacy tightening lowers the performance of the open-web stack, and that can matter more over the next 6-18 months than any headline-level sentiment reaction today.