@JohnFen Re: Well, of course
This. Very much this. I actually used to have 2FA enabled for my Google account, back when is was possible to go straight to OTP for that... Had to disable it for a while when my smartphone broke down and when I came back with a new one - lo, all of a sudden you HAD to have a phone number to activate 2FA. I've just checked again and either I am blind or this is still the case.