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
AOSP is a Google product.
That¿s why I said "the one you get from the custom ROMs". Well, the ones that fork and maintain on their own anyway.
The other alternative honestly is Linux mobile, once it more properly launches.