"... Google's AMP team even invited me to have lunch with them."
Reminds me of this: http://blackhat.com/media/bh-usa-97/blackhat-eetimes.html
As far as I can tell, in order to be "forced" on a user, AMP must rely on javascript, the browser used or maybe the OS (I trust they are not rewriting search results to point to AMP but that could be another one).
A no javascript command line tcp client will retrieve the page without automatically following the amphtml link. Users thus have a choice. And if choosing the amphtml link it is easy to filter out everything but the text of the page (the content). In that sense AMP is quite nice.
The "forced" nature of AMP should make users think about these points of control for advertisers and Google: javascript, browser, OS. Maybe website owners will think about them too the next time they "recommend" or "require" certain browsers. Web should be javascript, browser and OS neutral.