That’s Google Search, not AMP. How much bandwidth does Search use? Is it big enough to be a problem for some users?
> Downloads Google links you haven’t given permission you want to see.
Google Search can load assets from its own domain, like any other website. The user can use browser extensions to block certain requests.
> You can’t even opt out.
You mean you can’t opt out of seeing AMP results on Google Search? Well, yes, for obvious reasons. AMP is Google’s product. It would make little sense for them to add such an option.
> Breaks the web url extending it for Google’s own purposes. Breaks the understanding that the domain you are on is the authority for it’s own content.
Yes, it does.
> Copying URLs to send to friends or post online no longer works correctly.
It works in iOS Safari and Firefox for Android (and probably other browsers as well), which use the canonical URL when the user shares the page. There is also a Share button in the header of the AMP page.
> Traps publishers further inside Google’s web, not the open web.
You can say that Google traps publishers, but not that AMP is not the open web. Google AMP Cache is a website on the (open) web.