I might be wrong, but I don't think this project is the first of it's kind creating a decentralized messaging app, I was registered in such platform but I am still yet to remember the link to this platform so I can show you that we already have projects like this in existence and the admin of this project would have to come up with something better in order to take the users focus from those already working platform to this new platform that has just been launched.
Please make your research well and prove me wrong if I am.
I am sure there are some that have been implemented but have they gone so far as protecting not just data but metadata too (informatoin such as when messages are sent, where and from who)