They did for a while but it was too expensive. Uber uses OneLogin, who I'm sure is also investigating. We had apps on our phones that received as "is this you trying to log in?" notification. You had to consciously hit "Yes" in order to continue the login flow. It wasn't offline 2FA like Authy or something. There _was_ a much higher standard of security there.
This was _social engineering_, something that even the finest MFA algorithms don't guard against.
This was _social engineering_, something that even the finest MFA algorithms don't guard against.