Why do we still have SMS. It seems to be solely used for weak 2FA, account takeovers and scams.
When sites ask for a phone number what they are really saying is: give us this identifier that you can only acquire with a government-issued ID and a paid up ransom to a telecom. And if you later stop paying the ransom we can hand over your account to anyone who picks up the payment.
I've been collecting "signatures of hostility" from Bluesky profiles and "No DMs" is one of the most common, common enough that my agent [1] and I don't see it as a "no follow" sign.
[1] Still unnamed since it is in pieces on the floor, it probably gets named after a Tsunako character. KUrUMi?