@katherined I also logged into Twitter yesterday (I have not been there for a few days) and also got the message. I use an authentication app, but I assume I have SMS as alternative, haven't checked yet. Have you seen why they do this? Is it expensive for them to send/manage SMS service? Or simply hoping more with become Twitter Blue subscribers? Maybe best give up to understand why. It's crazy anyway to reduce security.
@hehemrin I’m sure it’s to save on the sms expenses.