The implication here is, if they implement this, is that they volunteer to assume liability, should e.g., your bank account be drained despite undergoing their forced strict lockdown on paid and owned devices.

Fat chance, because laws are meaningless to crime syndicates

That would just continue to ensure lock-in, and at least the EU would never go for that (& neither would I). Sideloading should still be allowed.

Google's Play Store security has never been all that stellar, anyway.