It looks like a combination of slack and video. Your video appears as a small bubble at the top of the screen, you have the choice to enable video and mic or just listen. For the most part the text based chat is just a way to share links and interesting content while chatting over voice. We've purposely limited group sizes to under 24 and kept everything private by default.
The experience is best on the web. Head directly to https://distributed.app for that and let us know what you think.
Note: just hacking away at some bugs on the android app related to creating groups and sending invites. All the source code for both web and mobile can be seen on https://github.com/m3o/distributed and https://github.com/m3o/distributed-mobile