It's clear that Chrome must be separated from Google and Alphabet, nothing else will stop them from trying to colonize the web.
Where did you read that? I was under the impression that SXG is more similar to things like IPFS, where you can have content signed by its origin (or in IPFS, content addressed by its hash). Once that is achieved, any other site (e.g. a CDN like Google or Cloudflare) can cache and serve it securely and with authentication.
You can sign whatever content you want with SXG, it isn't limited to AMP.
Or advocate for open alternatives, use Firefox, and make sure any site you build (or you build at work) work perfectly in non Chrome browsers.
Yes, supporting other browsers is a given, but did you want to say "and advocate"? Advocating for alternatives alone will achieve close to nothing when you are faced with a cartel, regulatory action is desperately needed in this industry.
This works because they have such a large market share. It's a chicken/egg problem. Switching to Firefox is the best most of us can do to achieve the goal of "getting people to stop following Google's leadership on all things web."
Only because we let them. We gave them web domination, we the nerds told everyone and their mother to install Chrome so they do out of habit now.
We sit and watch while Google bend the web to their will with AMP and dozens of non standard specs everyone hurriedly tries to support while we come up with excuses like "it faster", "the dev tools in chrome are better".
Without a monopolistic marketshsre we give them they can't do this as easily.
Go install Firefox and make it your default browser. Or just carry on using Chrome and wonder why Google keep getting away with doing antisocial, anti consumer shit.