Real URLs for AMP Cached Content Using Cloudflare Workers
blog.cloudflare.com
blog.cloudflare.com
Web Packaging was originally proposed in 2015 as a W3C draft (https://www.w3.org/TR/2015/WD-web-packaging-20150115/) and the Signed Exchanges spec as an IETF specification (https://wicg.github.io/webpackage/draft-yasskin-http-origin-...)
There is also an open source project implementing it that anyone can use (https://github.com/ampproject/amppackager).
> Google rolls out an experimental feature with no standardization in Chrome and here it's already supported by Cloudflare and in the wild.
still remains a valid argument to what you just stated.