That's not true at all. At any point your account can be flagged by their internal system and on your next login you will be forced to add a phone number "for security purposes". It happens to people all the time, but in particular, though not limited, to TOR and VPN users. So, yea, sure Discord's not at fault in the situation where a server admin turns on the phone number requirement, but they are definitely to blame when they force users, some who prefer to remain anonymous, to either give up personal information or lose their account forever (support will not help you).
Not sure if this can still happen if you've got 2FA turned on, but seeing as I see it mentioned more often from tech literate people (e.g. on here) who are more inclined to setup 2FA I doubt it makes a difference.
That's not true at all. At any point your account can be flagged by their internal system and on your next login you will be forced to add a phone number "for security purposes". It happens to people all the time, but in particular, though not limited, to TOR and VPN users. So, yea, sure Discord's not at fault in the situation where a server admin turns on the phone number requirement, but they are definitely to blame when they force users, some who prefer to remain anonymous, to either give up personal information or lose their account forever (support will not help you).
Not sure if this can still happen if you've got 2FA turned on, but seeing as I see it mentioned more often from tech literate people (e.g. on here) who are more inclined to setup 2FA I doubt it makes a difference.