There are so many great reasons to be on Signal. Now including the opportunity for the vice president of the United States of America to randomly add you to a group chat for coordination of sensitive military operations. Don’t sleep on this opportunity…
Editing to add the link to the messages: https://archive.is/2025.03.26-131842/https://www.theatlantic.com/politics/archive/2025/03/signal-group-chat-attack-plans-hegseth-goldberg/682176
However, unlike Signal, you can exclude external participating servers entirely.
(I heavily prefer XMPP to Matrix tho, even though I host both)