I use Authy specifically because of their backup options. That obviously requires collecting my phone number and email address. I have no problem with that beca

I use Authy specifically because of their backup options. That obviously requires collecting my phone number and email address. I have no problem with that because if I'm traveling and somebody steals my laptop, phone, and backup Yubikey I won't be completely shit out of luck. If you don't want to use Authy then use something else that doesn't backup the 2FA codes for you. But don't say 2FA is inherently a privacy concern. It isn't.