From my experiences discord servers tends to draw people who are least interested in talking about the project and more about casual talk and sharing memes. Most of the time these places feels like an equivalent of shoutbox feature on old forums.

Still, I received more support via discord than forums which on the other hand seems to be mostly full of people who vent their complexes and issues on users and lock discussions for absolutely every single stupid thing, just to show they're in charge.

Perhaps a community has to be small, dedicated, mature and aware enough to use e.g. Matrix or other solutions, leaving running blessed, approved discord servers to communities, various enthusiasts.