Twitter’s encrypted DM feature is technically flawed, opt-in, limited to 1-to-1 text-based messages, restricted to a small user base, and generally inferior in just about every way to encrypted apps like Signal and WhatsApp.

And all for just $8 a month. https://www.wired.com/story/twitter-encrypted-dm-signal-whatsapp/

Twitter’s Encrypted DMs Are Deeply Inferior to Signal and WhatsApp

The social network’s new privacy feature is technically flawed, opt-in, and limited in its functionality. All this for just $8 a month.

WIRED
To sum up, the best way to send someone an end-to-end encrypted message via Twitter remains the same today as it was yesterday: DM them and ask for their Signal number.
@agreenberg I hate Twitter direct messages; if you want to reach me, iMessage, Teams, or message me on Telegram or Matrix.
@agreenberg Delegated end-to-end security is a non sequitur.