I find it astounding that people here can not even grasp the concept of why Discord is popular. I am perfectly capable of hosting my own server and doing everything manually. But it is clear as day why discord wiped out the competition while most of the comments here seem dazed by the fact and are left wondering why people don't just use IRC.
It's no wonder so many projects and FOSS tools fail to gain large userbases when it seems that most developers seem to be living on another planet entirely.
This is an important point. I write that with no disrespect to all those FOSS developers who have devoted themselves to the work of creating new, interesting and useful things. But the fact is that usability, like intuition, is usually a very subjective matter. That's why QA and UAT were such an integral part of traditional software development, and why community engagement needs to be a two-way street.
Best comparison for Discord is to think it as social media site, Facebook or Reddit. Find or get invite to server, everything is there trivially. Creating your own space is simple, easy and fast. Everyone is already there.
IRC is pretty similar, but much more fragmented and not really very user-friendly.
It's no wonder so many projects and FOSS tools fail to gain large userbases when it seems that most developers seem to be living on another planet entirely.