This looks to me as a way for Google to drastically increase their reach and track even more data about their "users". They want the browser to "discover" the

This looks to me as a way for Google to drastically increase their reach and track even more data about their "users". They want the browser to "discover" the users interests automatically during browsing. For a page to be excluded from this, the page author would have to set a new policy header. And then your browser reports these interest to whatever tracker (for example Google) asks for the information. Suddently Google can learn about what you're browsing even if GA is blocked.