They also clearly explain why decentralization doesn't work for large rooms:

> Supporting large group channels (we have seen 1000 people taking turns speaking) requires client-server networking architecture because peer-to-peer networking becomes prohibitively expensive as the number of participants increases.

It's unfortunate, but it's just the truth. The reason we aren't seeing decentralized solutions to the problem that Discord solves is technical. It's not because people don't want it or aren't trying. I just doesn't perform well enough.