Because a big “Join our community discord server!” on the game’s title screen isn’t enough apparently. They have to put a flashy animated GIF at the top of every update notification, change the name of the game’s Steam forum to “Join Our Discord!”, and even reply to posts in the Steam forum saying “You should join our discord so we can chat about it!” as if a forum isn’t a good place to chat about the thing that’s already being discussed.
Bitch please, if I wanted to be in the hell that is Discord I’d already be there, you can stop asking.
I like that, and might use that in the future.
Since you mentioned developers using it to coordinate with their community, I also have seen a pattern where the channel owner invites people to come chat with them and the other people involved. Then when someone invariably pings someone on the team they get scolded for it. Pick one, availability to the people you invited, or stay private. Can’t have both.