People and groups do not have "Discord servers" any more then people have "Facebook servers". They've just coopted the jargon from actual voice chat servers like mumble, teamspeak, etc which you do run on servers and control what happens.
Using a centralized service like Discord where you are the product, where the protocol is intentionally and legally enfoced as proprietary, is a real bad idea.
You might want to re-read both the comment of my parent, and my comment again.
Parent complains that Discord 'servers' are misnamed because they are not literally individual servers. I asked them if they have a similar gripe with IRC, because IRC 'channels' are named that after radio/tv channels, but they are not literally radio channels.
That seems unnecessarily pedantic. Someone who cares whether the servers are open or not knows perfectly well that a Discord server is not a server per se.
Using a centralized service like Discord where you are the product, where the protocol is intentionally and legally enfoced as proprietary, is a real bad idea.