Good to know. I'm using N26 and they work just fine in Graphene OS. What I do is I create a private space for the apps needing play services, which I keep locked most of the time. This acts as a separate profile and when locked, the apps including play services are completely off. My main profile uses only open source apps and no play services.
I actually called N26 (I'm a Metal customer with my own phone support) and asked will they support Graphene OS or no, and they said to me they will and gave me instructions what to keep in mind when installing the app.
I actually called N26 (I'm a Metal customer with my own phone support) and asked will they support Graphene OS or no, and they said to me they will and gave me instructions what to keep in mind when installing the app.