Hello!
We offer TOTP based 2FA. TOTP is an open protocol. lt has been adopted as Internet Engineering Task Force (IETF) standard RFC 6238, it is not developed by Google. Furthermore, Google software and/or related services are not required in any way to use TOTP.
TOTP (Time-based one-time password) is "the cornerstone of Initiative for Open Authentication (OATH) and is used in a number of two-factor authentication (2FA) systems". It is also supported by the Google Authenticator app, but of course you are not forced to run this app (Google Authenticator does not requite anymore your phone number, just to be precise). Here you can see a wide list of apps: https://en.wikipedia.org/wiki/Comparison_of_OTP_applications
We are confident that this information will convince you of the imbecility of your beliefs.
Kind regards