Apple and Facebook, two of the largest content (re)publishers, have their own competing formats, and Bing currently spiders and parses AMP content as well. But thinking more holistically, many others simply pushed their content into apps, abandoning the web wholesale. Because while we can talk about how "well functioning" the web is, a virtually universal observation is that native apps that just wrap a web browser are sloggy garbage, and a big reason is that the HTML stack has grown so enormously flexible it becomes its own enemy.
We don't need a new version from Google that so far only helps with google rankings
I'm a charitable sort of person, so when someone like Google comes out with something I assess why they did it without presuming the worst. In this case we see silos appearing from Apple and Facebook, not to mention the appification of content, so Google looks for a way to keep the web compelling. And it is. When I see an AMP page there are a number of user-centric benefits that make it a draw as a link, not just speed but also best behaviors.
I mean, many of the complaints on here about AMP seem just surreal. For instance if you open the carousel (an option for trending topics like Trump) and swipe, it brings you to the next story in the carousel. This outrages some that you aren't locked in the gutter of a given site, which is just bizarre and anti-user.