The Chrome team says they're not going to pursue Web Integrity but…
it is piloting a new Android WebView Media Integrity API that’s “narrowly scoped, and only targets WebViews embedded in apps.”
They say its because the team "heard your feedback." I'm sure that's true, and I can wildly speculate that all the current anti-trust attention was a factor too.
Yes, I've done it myself following some tutorials online for Skyrim SE. It's not as simple as on Windows but it's definitely possible.
Cool, I'll have to look into that. That's mainly what's keeping me from going entirely Linux. I run Mint on my laptop.