I would recommend that people stop taking this kind of bait, especially as an organization. Discord is free for now but that's bound to change and you can't have any expectation of privacy there.
In my eyes they're practically the poster child for an organization who could (and arguably should) be running their own solution on their own servers.
Perhaps self-hosted Revolt Chat [1] which I've been keeping an eye on but I don't have any first hand experience with it. There are many more solutions in this space though.