John Gruber:

This is what you call a begrudging UI. Google wants you to pass around the google.com-hosted AMP URL, not the publisher’s original URL. If they wanted to make it easier to share the original URL, the anchor button would be a direct link to the original URL. No need for a JavaScript popover. You could then just press the anchor button to go to the original, and press and hold for Safari’s contextual menu. And they could just use the word “Link” or “URL” instead of a cryptic icon.

A quick thought: wasn’t the whole point of AMP to shrink page sizes and increase the speed of browsing? If that’s the case, why does Google have to pre-cache these pages at all? Shouldn’t they be fast enough on their own without the help of Google’s servers? Maybe they’re more interested in wrapping webpages in an iframe, inserting a Dickbar, and keeping users in an ecosystem that they have complete control over.