Phone verification for Discord? Seriously? You've just made anyone concerned with privacy read-only (which in crypto means almost everyone).
But yes, there won't be any spam, because no one will be there to receive it

It's not set in stone, and there has been a lot of SPAM as of late, we are trying to figure out a way to reduce the noise. The verification occurs at the account level with Discord. We (the straks team) do not have access to that information.