I can pick an AMP site out almost immediately. I click on a link somewhere, and a moment later as I start to the read the article I'm like: "this looks weird, like a crappy AMP site not a regular website!" I inspect the URL and sure enough it is. I always switch to the real site at the earliest opportunity. So not only is AMP terrible regarding the open web as others have commented, it's also freaking annoying on a pure UX level.