"Only rely on github" is amazing. And I have anticipated something crazier, maybe too crazy to be true. A server-less IM/forum mobile app which can hold persist

"Only rely on github" is amazing. And I have anticipated something crazier, maybe too crazy to be true. A server-less IM/forum mobile app which can hold persistant multi-party chatting. I know, server-less can mean a lot of information loss. I'm simply wondering if people can still find each other after going offline and online with a different IP, and even somehow retrieve information during offline time. As a tradeoff, the users understand and don't care if some messages are dropped (as chatters can figure it out using human brains) or security threats (MITM, eavesdropping, etc.). Since I'm new to network and P2P, this can be nonsense. And if this is possible, can anyone provide some links concerning the problem? first comment on HN :)