There must be some alternative European social logins, I know Seznam (of mapy.cz/mapy.com fame) has one: https://vyvojari.seznam.cz/oauth/doc?lang=en

Problem is that there's no point in adding it unless a sizeable number of people using it, and Spotify is the only European one I can think of where that's the case. Seznam clearly isn't unless potentially a cz-only service - no idea how popular it is there.

Delivery Hero is really big and EU but too fragmented. Maybe Wise should add social login, I think Paypal has it.