I'm a discord user. I'm in several servers. I'm even Nitro.

...and I'm probably not going to join your server to ask questions or get help. If I can't get help via your git platform or shoot off an email, I'm probably just going to not use the software.

Gitter, for all it's flaws, is ok for this case. The effort to join is very low.

Discord is a whole beast. Every server has a gauntlet to join with a dozen bots and channels, and then Discord over-notifies you for every message until you tune it down.