It is completely wrong to optimize for viewing while breaking expectations for anything else. COPYING THE URL is very frequently the next thing I want to do, and AMP destroys this. For example, when looking up recipes, I often create a multi-device-sync note containing the URL, where I add a shopping list and whatever other notes I want to make; it makes no sense to be forced to copy a mobile-only, Google-domain link for almost every search result when next time I might be opening the page from my desktop machine!
Another major problem is that the only indication of this hijack is a little lightning-bolt and "AMP" next to certain links. I guarantee most users don’t know what that even means so problems will be blamed on “the site I clicked” and not “Google”.