AMP onboards the publishers onto Google's platform and effectively holds their content for ransom. Makes it easy to implement revenue sharing on advertisements or subscriptions, especially when all AMP ads must be "approved" and "compatible." Watch, the next move from Google will be a paywall subscription service for publishers with 30% revshare to Google and some kind of unified subscription management and/or bundling for users. Or before that maybe we'll even see "AMP for desktop".
The only way I can consider that you're not vastly over exaggerating for no reason is if you do not understand what ransom means.
You're a publisher. Google takes your content. They host it on their server, behind their domain name. If you want it back, you can forego implementing AMP. But good luck with that, because your content will rank behind the dozens of other publishers who do comply.
Share less, find your strongest point, stick with it. Less is more here:
"Google will use AMP to implement a revenue-sharing system with publishers."
That seems like a plausible step for Google to use to counter ad blocking.