> Almost all of the Apps I have on my Android phone are installed from F-Droid ... I see that, at least for now, it's optional and you can un-enroll, which is good.

I can't see it going away. Google uses it to fend off monopoly accusations, viz you aren't locked in, you can always use another app store. Apple doesn't, and they are in a much more threatening territory when it comes to anti-trust law suites against their app store because of it. https://www.cnbc.com/2020/10/06/house-antitrust-subcommittee...

Google has far worse anti-trust problems than Apple in general because they own 80% of some markets, and is being reminded of it repeatedly by ongoing law suites being brought in various countries. https://www.vox.com/recode/2020/12/16/22179085/google-antitr... But for Google Play they have a free pass, and I don't think they aren't likely to give it up any time soon.