[plokiju]

You don't need to root an android to install apps from outside the play store

[ulrikrasmussen]

What I meant is if I want to run an open source OS like LineageOS. In principle this is possible, but Play Integrity will refuse to work when you have a custom ROM.

[anticensor]

Some apps go far beyond that and actively check your installed apps against a whitelist and refuse to work if anything unknown is found.