It's still closed. It's hacky because Discord is generally a messaging app. You can wedge things into messaging apps but the UI is suboptimal. I did an AI art symposium at Google towards fall 2022 and it was __impossible__ to explain to a designer how to use it in under 2 minutes. Ended up dropping it entirely.
I would have going in, but it seems obvious in retrospect.
#1 Remember, designers, these aren't people who know who or what or when an IRC is.
#2 To even get going, you have to be able to mentally model the chat entry as a command line, and have an intuitive understanding of a slash command.
#3 The conceit was there were 3 laptop stations, one for Dall-E, one for Midjourney, one for Imagen, and they were rotating stations every couple of minutes. Adding time pressure didn't help.
Another way to think about it, real dialogue we had: wait, I'm at a chat app...okay where you chat, you want me to type slash...okay then imagine...wait whoa what was the menu that popped up after slash...wait whoa why did it go away...okay slash, and what do i type after that?...okay, imagine...wait, no space? okay '/imagine'...wait can I just load Dalle-E that was easier?
Discord is just Kryptonite to some people, myself included.
I eventually got used to it but I don't enjoy it. First time trying to log in it didn't believe I was a human + the way most servers have you add a react emoji to confirm you read the rules and only then do you actually see the channels available to you, not to mention all the alert sounds with no visual indication of what just alerted, something about it just makes me feel old.