I'm going to be looking for ways to prevent Google Play Protect from automatically deleting the app and marking it as a PUP. This doesn't happen at the moment, but I suspect it'll start happening soon as more people start to use it.
It also appears a lot of AVs mark any app using FRP as a trojan/PUP, which doesn't really matter, but it might scare some users. So I'll be adding full compiling instructions soon.
Feel free to leave any suggestions or share your experience with Google Play Protect.