Banking apps will work on Graphene if you have sandboxed Google Play Services installed, and if the banking app requires only a basic level of Play Integrity attestation. I got the same level of support with my previous LineageOS for MicroG phone as I have with my current GrapheneOS phone, it just required a lot more tinkering (and was a lot less secure).
I do appreciate the work the GrapheneOS team puts in toward compatibility, and especially the fact that they just got RCS messaging working. But any time Google or even an app vendor wants to tighten the noose, they can, just by requiring the higher, hardware-backed attestation level.
I do appreciate the work the GrapheneOS team puts in toward compatibility, and especially the fact that they just got RCS messaging working. But any time Google or even an app vendor wants to tighten the noose, they can, just by requiring the higher, hardware-backed attestation level.