I’ve had no issues personally with my banking apps. Most require sandboxes gPlay to be installed but there was no need to be logged into google for them.

Not sure now up to date this list is now but check out this site: https://privsec.dev/posts/android/banking-applications-compatibility-with-grapheneos/

You can also use obtainium, it’ll download and install from the GitHub link, just make sure to check the pre-release box since it isn’t offically released, saves having to manually update too

Its a fork, GitHub below https://codeberg.org/Bazsalanszky/Infinity-For-Lemmy