TLDR: The r/selfhosted subreddit has a Discord server. The owner’s account got hacked leaving the server in a precarious state. They submitted a support ticket, but Discord has not taken action in weeks and probably won’t at all, so they are considering starting a new Discord server.
What advantage does it have compared to Matrix?/IRC?
It mimics discord, so functional voice rooms with screen sharing, text channels, and so on…
Matrix has all that these days too