I think the real issue here is hardware attestation. GrapheneOS will not protect you.

I will believe the GrapheneOS-Motorola project is a thing when I receive the phone.

Google hates real competition. They blasted out Chrome when Firefox was really taking off and normies were discovering adblocking. Chrome allowed adblocking as a honeypot until everybody was safely in their garden.

The goal in this for Google is to support digital ID. Every totalitarian goal currently being employed requires a digital ID and phones are how they want citizens to access their digital ID (the actual digital ID is created, owned, and managed by the regime, though they will outsource). However, this requires a phone they completely control. Google doesn't care about GrapheneOS or Agoristic users and will lock them out without even thinking twice about it.