@enkiv2 Oh yeah, that's exactly why the ones I've encountered have used Discord, and I've even participated in some.
It's entirely valid, but it's unfortunately a means of communication that I personally find anxiety-inducing, even compared to other instant messaging systems. (No idea why - I don't exactly love Matrix or Slack, but I have nowhere near as much trouble with them.)
Although, predictably, my most comfortable milieux for zine production have been e-mail lists and message boards, I recognise that that era has rather passed.