“Nothing about any of the protocols we’ve developed requires centralization; it’s entirely possible to build a federated Signal Protocol-based messenger, but I no longer believe that it is possible to build a competitive federated messenger at all.” — Signal Founder Moxie 

We believe that the messenger in relay mode is superior to the messenger in federation mode and centralized mode.

https://signal.org/blog/the-ecosystem-is-moving/ nostr:note1063mar49nu5edjcr8zqlgjs8zl3dlve5p74twv43sv3s9ztaykhq38vv7w