Tell HN: GitHub is no more usable without mobile devices

Since Microsoft bought Github, I have to use a one-time key every time I log in, which is annoying. But today I received a letter in which they insist that I have the second of two factors from the list:

     Security key

     GitHub Mobile

     Authenticator application (TOTP)

     Text messages (SMS)

I don't use smartphones, so all I can do is share my phone number, which will naturally be passed on to spammers. Tell me an alternative to GitHub, please.