My issue with most of these discord servers is almost all of them just kick people who don't talk much. I've stopped bothering with them for that reason. I have also noticed overly zealous admins/mods which is quite irritating. One example was one which started having a fit about lurkers when someone didn't reply to him within 5 minutes.

Most people join pornographic discords to jack off, not to enter a social community (while I appreciate some do) and deal with "quotas" of contribution from admins too emotionally invested in their own server. The constant pruning and overzealousness will always cause these communities to die because people will be driven away, especially in a place like this.