Discord was originally for gamers so most communities I was part of had their own voip servers.

In the 90s it was in game chat, forums, VoIP, possibly an IRC channel. That was a lot of infra to juggle and usually it wasn’t all hosted by the same person. So if xXxDarkNinja69xXx got his feelings hurt he might take down the teamspeak and then your community is up shit creek without a paddle until you can find someone else to host it.

Discord does a merely-okay job of all of that, and possibly Reddit has supplanted the forum bits that discord can’t, but it’s less overhead for the administrators of each community.

I don’t really do any gaming these days so I too don’t use the VoIP, but that was a big part of the allure when discord launched.