Day 4 of using #GrapheneOS: Though a fair deal of apps work just fine without #GooglePlay - some even saying "the system is incompatible", but still allow you to use the app - some apps require Google Play Services. That's why it's good that Graphene OS includes the option of installing a sandboxed version of Google Play Services, that keeps it out of your way. This is required by some official apps to even function, as it fixed a few apps that wouldn't stop loading. It also logs access.