GSManiac:Now if you want sms 2FA on your twitter account, you have to be a blue subscriber. If you don’t remove 2fa from your account, you will be blocked from your account.
According the Twitter's press releases, here's the logic
There are "bad actors"
Good people use two form authentication. Additionally only good people are willing to pay $8/month.
Bad actors could never afford $8/month.
Magically, bad actors are not able to use two-form authentication, in the same way vampires can't see their reflection in a mirror.
Since you won't pay $8/month, you're 50% bad, and blocked.