Comment by ece

Scams are the justification, F-Droid hasn't had any scam apps throughout it's existence, and it's not clear every functionality it currently has will be preserved with this change like auto-updating apps and easy installation of the store itself.

Google could let users add their own signing keys (like browsers allow), and it might be they will let students or power users do this, or they could do what F-Droid does in packaging FOSS apps without developers having to provide extra PII information. If they do neither of these things, it de facto means they're only after control at the expense of normal users.