[FlxMgdnz]

Such an identity provider does not exist unfortunately, at least not with enough users to justify an integration for you. Of course you can always set up your own SSO provider (with the tools listed in AHOHA's comment), but that one would be limited to your own user base.

I'd propose you take a look at passkey, which allow for a very convenient, but privacy-friendly alternative to social SSO.

You can even combine social SSO with passkeys. Then users could sign up to your sites with one click through Google or Apple, but any subsequent login can happen between you and the user with a passkey. That's how we are doing things at hanko.io