That's not coming soon, that is a thing that was happening on compromised servers years ago (and probably still, but to a lesser extent given the decline in popularity of meme coin launches)

A few years ago, if you visit a site, your laptop grinds to a halt and the fan starts spinning like crazy, you know there is crypto mining happening on the site.

(btw that was a really good showcase for WebAssembly. Too bad it's used for illegitimate purposes)

Already been done, albeit without the webgpu part. I think some browsers already block crypto miners

It's a shame in a way, it also blocked the pseudo-captchas that used mining to limit spam.