AMP takes control away from web publishers by forcing them to allow anyone to serve their content (signed exchanges). Publishers no longer have control over how their sites get served (for example, no more server-side logs, because Google has forced you to let them serve your site).

It allows large sites (like Google) to have more control over smaller sites by putting back buttons at the top of your website in order to take them back to Google Search. The related "portals" scheme is the new "can you open all external links in a frame?" and small sites are going to be hurt the most.

Hardly anyone would implement that garbage if they weren't being threatened by Google with a traffic drop. If the ultimatum were "just make your website fast and add some schema markup to get in the carousel" then that would be fine. Forcing the entire Web to change to a restrictive format and load JavaScript from Google's servers, and seizing control of how websites are hosted is terribly damaging to the Web itself.