@philippemargery @61 @Purism Signal isn't "bad". In a nutshell:
OpenWhisperSystems / the devs behind Signal made the choice to centralize the service and build identity around the phone number system, instead of doing the federated / decentralized approach.
They did this consciously to encourage widespread adoption without the traditional difficulties associated with a decentralized, multiple-client approach.
That makes it different from approaches by Matrix.org, XMPP, and so on. 1/2