Because it isn't people "just enjoying NTR" causing problems, it's people that go over to their thread and whine about how the NTR content doesn't get translated or worked on that cause issues. I've seen it happen myself now, it's strangely common if you check back through the threads there. We have people in this thread that have admitted to doing it as well, lol. They just assume/joke that people that act like that are from here, kind of funny.
I think people have tried making NTR unavoidable in several games over there as well if I'm remembering right. Imagine if devs tried forcing lolis or scat into every game with user made content as unavoidable content. Most people with kinks like that at least understand their tastes are unusual and avoid stuff like that. For some reason, a lot of NTR peeps are lacking that awareness. Get to see it all around this forum with people that fight tooth and nail to not admit something is NTR or at least should have some kind of questionable NTR warning.
Like yeah, I get it, NTR isn't as straight forward as a lot of kinks and everybody draws that line at different places, but sometimes it's pretty blatant. We should just warn people even for the "Light" NTR anyways. There's no reason not to. This game could really have the tag even though I think all of it is optional.
TLDR: There's a history with NTR there basically.