Real unfortunate news for GrapheneOS users as Revolut has decided to ban the use of 'non-google' approved OSes. This is currently being posted about and updated by GrahpeneOS over at Bluesky for those who want to follow it more closely.
Edit: had to change the title, originally it said Uber too but I cannot find back to the source of ether that's true or not..
Unfortunately, this is probably because of the apps started using the Play Integrity API, which is a hardware-based attestation and can only be faked in two ways that GrapheneOS isn't interested in:
you can fake an older device that didn't support hardware attestation yet, or had a broken implementation
or you can try getting leaked vendor keys and emulate the crypto with those until they get revoked