AppLovin and Criteo show why measuring an outcome is easier than putting a balance sheet behind the miss. The open web can define an outcome, measure it and settle a campaign. What it cannot do is guarantee that outcome across company boundaries, and neither, it turns out, can the walled gardens: AppLovin's 10-K says no fixed price per action, and Meta's own documentation says the cost cap is not guaranteed. AppLovin's advantage is a closed loop that lets one company observe performance, adjust price and keep the spread. Criteo came closest to carrying real risk on the web, buying impressions and selling clicks, and its loop depended on identifiers controlled by browsers. The open web is not dead. It still lacks a credible counterparty behind the miss.