I didn't expect you to do anything about it. Was just emphasizing that 2FA is not a legitimate reason to require a phone number, that's all.
edit: I think I might have been a bit ambiguous: people who use as in "implement it into their authentication procedures" are the idiots, not the people those idiots are forcing to give up their phone number.
That's not even a full byte! Surely we can spare 6 more bits and support 255 genders.