> Aside from collected data being used for other purposes besides advertisement In the case of the Turtledove API proposal (https://github.com/WICG/turtledove

> Aside from collected data being used for other purposes besides advertisement In the case of the Turtledove API proposal (https://github.com/WICG/turtledove https://github.com/WICG/turtledove) the collected data stays in the browser and can only be used for privately targeting ads. (Disclosure: I work for google, speaking only for myself)