> I believe it's possible to keep an app's data on uninstall. It's not the default behavior, but that doesn't really matter in this case.
It's not and it does matter.
> And what does "legally mandating them" even mean?
Not sure how what's unclear about "legal mandate". If the law says, Google complies.
> The "security issues" exist regardless of this policy change - as I've already said.
They don't exist to the same extent, you repeating them doesn't make them more universal or true. Other vendors and forks exist, the simple existence of Google Play didn't mean every app is compromised by Google, now it will.
> Google could easily do whatever they want with your phone anyway due to control over system apps and the OS
Google doesn't control every vendor, controlling all signing keys is much easier than quite literally backdooring the OS for simply Google. There's a large difference in how visible any such malicious actions would be.
> As for "forced monetization", that's just reaching
Are YouTube's forced midroll ads "reaching" as well? There's no fundamental difference, they monetized someone else's content.
Controlling signing keys allows to simply patch the ads in. I'm not entirely sure why you don't see how it makes it easier for them.