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> "I really wish there were a way to know whether I already used Facebook, Google, or Apple to log into a site or app before"

You can. On each of the places you mention (Google and Facebook, certainly), somewhere in a settings page/window, you'll find your list of 'authorised apps'.

These will be a list the login systems to the third-party sites you've used to log in with.

You should then see a way to 'revoke' their access to your data.

That doesn't solve the problem. You would have to go to every method to figure out which one it might be listed under. It needs to be in the browser/password manager to tell you which service was used.

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