It seems to me this is a blocker to use if google can restrict sideloading like this. Its not going to end with just get people requiring to register their app with an identity. Wont they be able to put presser on f-droid devs to lock out software they consider a threat to some business model?
If the issue Google has with sideloading is really just the rampant app piracy (and the malware that comes with cracked apps) that might be something F-Droid can accomodate.
> sideloading
That newspeak term should just disappeared. It only contributes to the image that downloading and installing an app is something that is outside the "happy path". Installing software of your choice on a device you own shouldn't be demonised