Discord is easy to setup and use. It’s basically a chatroom with history. It can help build a community. It’s also a horrible way to store/archive information because it focuses on real-time communication. At larger scale it also tends to get too noisy.

Lots of users gush over Discord for some reason. My impression is that more technically minded people don't really like it, but your average user uses it for almost everything and encourages more services they like to use it. Hence why many reddit subs moved to Discord - the mods didn't necessarily prefer it, but they were sent an overwhelming number of requests from their users.