@Moem Yea from the video, and what i have read, it is a nice application on paper.
Also there signup process for account creation is just your "username" no email or phone number required, that is also a really nice privacy first account creation.
However now that i think of it , usernames are pretty target able for a lot of people.
So a even better account creation would be to create a random available id, and change the nickname after.
So yes if someone is willing to build it, and maybe some research further to see how it is actually handling the encryption and security aspect of chat, voice and video calling... it will most likely be nice to have in the openstore.