4 pane comic of dolan on the left and spooderman on the right
pane 1 (dolan): cum join opensurce cummunity!
pane 2 (spooderman): shure! how joyn?
pane 3 (dolan): Here discord! (with discord logo)
pane 4 (spooderman with tears in eyes): y u do dis?
Yeah, I was referring to official forums for technical support or feature requests and the like. I don't really think that everyday people were usually the ones who setup forums, it is website operators and other techies who set those up. The people who setup an independent forum are not the same people who setup a discord community. Discord has a much lower barrier to entry that usually results in a lower quality information and moderation than a forum would.
I mean, yeah, forums are harder, for sure. $20-35 monthly for a mail provider seems to high to me; I would expect that to be about the yearly cost. But, I don't really have much experience with an email provider for that use case. Really the problem lies in that a website operator and a community maintainer are 2 very different types of people that rarely intersect.