Just use matrix. There are plenty of places that will host your rooms for free, and some will do it for a price. It's always possible that your host ("home serv

Just use matrix. There are plenty of places that will host your rooms for free, and some will do it for a price. It's always possible that your host ("home server") will not last forever, and I'm not an expert on home server mobility, but it's certainly currently much better than any proprietary host, and the important part is that the community is empowered by the protocol to solve the problems they need solved, including mobility and longevity, if need be. But that's just a worst-case scenario. It would be surprising to have to solve these problems yourself.