

Yeah, only thing I can think of is the few banking apps that don’t have web versions.
I was lucky enough to have all my banking and 2FA apps work perfectly on GrapheneOS. The only app that gave me a significant amount of trouble was iClicker, which my school uses for attendance. That was fixed by enabling Google Play location services, and there was a (fairly expensive) alternative anyway.
I did have to buy a new phone to use Graphene, because I got my previous one as part of a carrier’s cell plan, and it had a locked BIOS. Though I think the purchase was worth it, and just moving my SIM card from one device to another was enough to get it working.
Going by their Mastodon account, seems they were erroneously detected as “from a US-sanctioned region” and it took too long for said error to be resolved, so they just made the switch.