https://keepandroidopen.org/
I guess I wasn't clear enough as you do not seem to understand the issue. Google is requiring *all* apps, regardless of how you install them, or from what app store you install them, to be signed *by them*. This means that every app available on F-Droid must be signed (and developer dues paid) also or it won't be installable. This not something F-Droid is willing to do because the whole reason F-Droid exists is to give users access to software by open source and other developers who can't or won't pay the Google tax and fork over their information to Google.
If F-Droid were to participate in Google's scheme to extort developers, it becomes a huge liability for the open source developers themselves, should Google suddenly decide their app violates their policies and IP, and slaps them with a lawsuit (even if frivolous).
The whole thing is quite nefarious. Google used to take a 30% cut in their app store, but they were legally censored for it (the whole reason we're here talking about this). Now instead of just the 30% cut they can charge literally all android app developers a fee (one-time for now, but that could change quite easily), and hold control over all of them even when they don't even use the Google play store. It's evil genius really.
But as the other poster said, no one really cares, sadly.