There could be several reasons. For some, it might be a way to experiment with different genres within the Naruto fanfiction world. Maybe they want to combine horror or grotesque elements with the Naruto setting. Also, it could be a reaction to the sometimes overly - sanitized and positive portrayal of characters in the official Naruto series. By creating a 'Naruto eats flesh' scenario, they are trying to add a sense of realism or a darker undertone to the story. However, this is still a very abnormal and not - so - common approach in the world of Naruto fanfiction.
Some people might create such fanfiction for shock value. They want to stand out by coming up with the most extreme and unexpected ideas. It could also be a form of exploring the 'dark side' of a character, taking a well - loved hero like Naruto and twisting his character into something completely unrecognizable. Another reason could be that the writer has a very different and perhaps warped view of the Naruto universe and wants to express that through this very abnormal concept.
Yes, there might be some out there in the vast world of fanfiction, but it's likely a very dark and disturbing take on the Naruto universe. Most official Naruto stories don't have such elements as Naruto eating flesh. Fanfiction can sometimes explore extremely abnormal and unorthodox ideas, but this goes against the general positive and heroic image of Naruto in the original work.
It could be a way for fans to further explore the deep connection between Naruto and the Kyuubi. Since their bond is so strong in the original story, some might take it to an extreme with the'mate' concept, thinking about how their relationship could be on a more intimate level in a different, non - canon way.
Another reason could be a very dark and alternative interpretation of the characters. Maybe the writer has a different view of Naruto's character arc and how he could be pushed to the extreme. And they see Sakura as a character that could be sacrificed in this extreme version of Naruto's story. But this is a very far - fetched view considering the original story's development.
One reason could be for the sake of creating drama. Writers might want to explore how the Naruto universe would be shaken up by such an event. It could also be a way to explore different character aspects of Naruto and Hinata that aren't shown in the original, like how Naruto would react to such betrayal.
Some people might create such a fanfic just for the shock value. They want to break the norms and create something that is completely different from the original story. It could also be that the author has a very different interpretation of the characters' relationships and is exploring a very extreme 'what - if' scenario.
One reason could be to explore the power dynamics within the Malfoy family. Lucius is often seen as a powerful and strict figure, and this could be a way to show how far he might go in disciplining Draco. Another reason might be to add a dark and edgy element to the story, appealing to those who like more complex and disturbing plotlines.
One reason could be to create drama. Writers often use relationship conflicts to make the story more interesting.
Some people might create such fanfiction out of a misinterpretation of the characters' relationships. They may want to explore extreme or 'edgy' scenarios without considering the ethical implications.
Some authors may write it to add a new dimension to the Naruto universe. Naruto has a huge fan base, and by exploring such a taboo topic, they can attract readers who are interested in seeing a different side of the character. It could also be a form of creative exploration, to see how the story and other characters would react if Naruto were to reach such a low point in his life.
It could be an exploration of the darker side of human nature. Writers may use these characters to show how relationships can go horribly wrong, even if it's not in line with the original story.