Starting in August, installing APKs from unverified developers will require a new procedure called Advanced Flow. It involves enabling developer mode, rebooting the device, and waiting 24 hours with biometric verification.
After that, you choose: allow the APK installation for 7 days or indefinitely. The procedure is a one-time process and applies to all versions of Android.
Will the 24-hour wait stop you from installing APKs outside the store?


https://www.androidauthority.com/grapheneos-motorola-partnership-announced-3645710/
Oh, that’s pretty cool. I think I’ll consider switching to GrapheneOS in the coming months.