I've found the blog post where moxie argues against federation: https://whispersystems.org/blog/the-ecosystem-is-moving/ https://whispersystems.org/blog/the-ec

I've found the blog post where moxie argues against federation: https://whispersystems.org/blog/the-ecosystem-is-moving/ https://whispersystems.org/blog/the-ecosystem-is-moving/ "One of the controversial things we did with Signal early on was to build it as an unfederated service. 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."