The popular predecessor to Discord was TeamSpeak. It ran on your own servers and that made it hard to set one up. That's why Discord groups are called "servers", they were hijacking established teamspeak terminology their audience would be familiar with.
And reddit died around the same time by extreme over-moderation.
dont forget about vent and mumble!
mumble, admittedly, not so much.
No one said discord wasn't popular. It's substantially popular with gaming communities. It's also very popular with non gaming communities, many of which found it an an alternative to Reddit and others.
"This is such a wrong thing to say that I'm surprised you haven't received reprisal for it"
Proving his point in real time
It's like you custom designed your post to make his exact point.