looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don't run a complaint browser ( cough...firefox )
here is an article in hacker news since i'm sure they can explain this to you better than i.
and also some github docs
Linux, but that's not a viable option. I would use degoogled Android OSs. GrapheneOS, CalyxOS, e/os, and LineageOS are some of the popular ones.
I use SailfishOS and while it's more work, it's viable.
Also correct here.
The 3 main have varying degrees of function vs security/privacy and should be researched.