That is true. But then many people put a lot of trust in the major providers in many other areas too, such as hosting their private files and email, holding card payment information, and so on.
5 karma · joined November 23, 2022
If you have to log in to a website via one of Microsoft, Google, Facebook, Twitter, etc. then, if implemented properly, there's no way of knowing if an account associated with this external identity exists already.