But in those cases people actually hosted a server, right?
In discord it's more like a slack workspace, right?
The people "hosting" a discord "server" are not actually running hardware anywhere that runs the server?
98% of the people hosting "servers" of any kind in the world are not actually running hardware, everything is timesharing compute on a hyperscaler's computer now.
But yes, a Discord server is equivalent to a Slack workspace. It's just inherited terminology.
That's correct. Discord co-opted established terminology for its own ends and it was very successful.
For what it's worth I never actually hosted a ventrilo server either, I always just paid a service to do it. Pretty much the same experience as discord is today.