Negative, if you get their triggered anti spam response for creating an account fresh, or even logging into an existing account, you literally cannot log into that account anymore without providing a nonvoip phone number. You have to attach a phone number to continue.
What's the issue? Maybe the user doesn't have a phone number to give. Maybe the user already has that phone number attached to another account. Maybe they don't want to attach their phone number to a huge set of data, depending on their use, if indeed discord sells or begins to sell it. Rhetorical question if you ask me.