About automatic silent app updates:

Which OSS app store has them? In theory I see Obtainium and Accrescent do.

However with Obtainium I've always been prompted to Update. Sure, updates were downloaded in the background but user action was required.

Can't speak for Accrescent as I have not used it.

Also, in several code tests I could not make it work despite having the right permissions (UPDATE_PACKAGES_WITHOUT_USER_ACTION) and being Android 12+.

I would appreciate feedback on this issue as I'm not even sure it's possible.