Last time i checked they have no revenue possibility. So I decided to skip, I am curious on this too
https://www.reddit.com/r/privacytoolsIO/comments/57n8ee/inst...
As I see it, there's some sort of trade off for all solutions for private instant messaging right now. Wire comes close to a good solution. The biggest problem for me is that the official Android client is quite buggy, UI wise...