I have OnePlus 7 Pro that I successfully flashed with LineageOS 21 with MicroG. Do you have some interesting apps or ideas to take advantage of it? I thought of some Magisk modules. Maybe someone is more experience than me! This is the spare smartphone, the main one is GrapheneOS, so I don’t mind breaking stuff.
I think the new “safetynet” is “Play integrity”. I think you need playstore installed and activated to pass the test though.
At least, it seems like many apps are ok with passing only safetynet though, so probably not a big issue yet.
Google Play and their services are so tightly integrated with Android, no wonder GrapheneOS did their sandbox… However, I thought of doing the same with microG.