I think your number is too big, home many nude mods can be for a game? If you mean some revealing armor/clothing then that is not porn not even "adult".

There will always be a large number of lower effort mods, it is easy to retexture or cut parts of existing armors then building new ones from scratch.

The main issue I see with some modding communities is the big egos of some people that leads to terms of use like "don't share this, this mod should not be shared on as different website" , it will make it kind of illegal then when the specified website will no longer exists to archive and move the mods or to create mod packs.