Finally broke down and got on Discord. It's every bit as trash I as I remembered, and I feel vaguely gross ethically, but I've just got to keep remembering that you have to meet the community where it's at and I can't selfishly expect the community to change just for me. The work of organizing is more important than my dislike of the tools that don't match our values.
That being said, I will be limiting my use to #IWW business only and will *not* be joining "just for fun" discord servers.