The Signal Protocol is a set of cryptographic specifications that provides end-to-end encryption for private communications exchanged daily by billions of people around the world. After its publication in 2013, the Signal Protocol was adopted not only by Signal but well beyond. Technical informat...
No and that’s why signal can decide on their own if they want to enable chat with other messager or not. Meta has no choice anymore.
Matrix shows me that you can have both secure and decentralized communication.
Matrix does have a lot of unencrypted metadata, though, only the message contents are really private. That is not enough for some people.