The main reason might be that the majority of readers are not interested in such content. Also, platforms and publishers might have strict policies against them, limiting their spread and popularity.
I think it could be because dirty fanfics are not widely accepted in many communities. They might be seen as inappropriate or offensive, which stops them from getting a lot of attention.
Maybe because they often go against social norms and moral standards, so people are less likely to make them popular.
Maybe it's because they often contain inappropriate or uncomfortable content that goes against our values and preferences.
Maybe it's because creating really good fan fiction takes a lot of creativity and time. Not everyone has that to spare.
There could be several reasons. For one, coming up with unique and interesting storylines can be challenging. Also, not everyone has the writing skills or confidence to pen down fanfiction.
Maybe it's because the topic is a bit intense and not everyone is comfortable writing about it.
Maybe because the comic is not something that needs to be kept secret or hidden. It could be openly shared or displayed without any negative consequences.
Well, there could be several reasons. One might be that communities have strict rules and enforcement against abuse. Also, fans themselves value the positive aspects of fanfiction and don't engage in such negative behavior.
Maybe it's because the content of M-rated fanfic could be too mature or inappropriate for some audiences. Publishers or platforms might have restrictions to maintain a certain level of suitability.
Well, not having to hide the Undertale comic could be because it's not controversial or against any rules. Or perhaps it's been approved for public viewing and doesn't pose any issues.
Maybe because it's not something that needs to be hidden. It could be freely accessible and not have any controversial or sensitive content.
Maybe it's because the subject matter is too serious and intense for that kind of content. The show's focus is on crime and justice, not what's typically associated with GP in fanfics.