Google now only knows the first page I visit from its search results. After this update, Google will be able to follow me across the entire web, because it will the one who serves it to me. How is that not a concern?
Are you seriously claiming that the largest ad company in the world is interested in decentralizing the web? Its blog article you linked to yourself says, that the goal of this entire initiative is to increase the usage of AMP by "displaying better AMP URLs".
> After this update, Google will be able to follow me across the entire web, because it will the one who serves it to me.
That's not how it works. Only the initial page is loaded over cross-origin server push. After you actually navigate to that page you're no longer on Google's site (which is why the URL bar is able to show the domain of the site you just navigated to instead of still showing google.com), so obviously they don't have any enhanced ability to monitor what you do after that point.
> Are you seriously claiming that the largest ad company in the world is interested in decentralizing the web?
The general web is already decentralized. This is about decentralizing AMP. And yes, decentralizing AMP is exactly what Google is doing here.
> the goal of this entire initiative is to increase the usage of AMP by "displaying better AMP URLs"
Yes, and they're accomplishing that by pursuing the development of open W3C standards which can be used by anyone. Just like how offline storage on the web started as a feature enabled by [a proprietary plugin developed by Google (Google Gears)][1] until Google pursued the development of open standards to replace it: https://www.w3.org/TR/service-workers-1/ (Check out who the editors are on that draft.)
Google's been following this pattern for over a decade now. They start with a proprietary initiative, then use the lessons learned from that effort to develop open web standards that improve the web for everyone. (I can give maybe a dozen more examples if you still don't believe me.) There's no reason to think AMP will be any different in this regard, especially since Google has already made their intentions on this matter clear.
Are you seriously claiming that the largest ad company in the world is interested in decentralizing the web? Its blog article you linked to yourself says, that the goal of this entire initiative is to increase the usage of AMP by "displaying better AMP URLs".