I agree there are probably better options out there, but scrolling through the comments, I had seen a lot of discussion about Discord and not nearly as much on Nintendo. I was hoping to stir up more discussion on Nintendo's involvement.

Discord's reaction may be unreasonable, but it isn't ridiculous to see them bend over for Nintendo when they're faced with hosting a smaller community (relatively speaking) or becoming a target of Nintendo's lawyers. Had they been on another platform (self-hosted or not), Nintendo would have likely persued them all the same. Also, as far as I'm aware, the developers themselves believe that they are within the law. The issue comes from Nintendo disregarding the law and harassing them anyway.