Perhaps the author wants to explore a darker or more cynical side of Naruto. In the original, he is very much a team - player and values his comrades. But in this fanfiction, showing him not caring about Team 7 could be a way to show how he could have turned out in a different, more negative situation.
It might be for creative exploration. Writers often like to play with established characters and relationships. By making Naruto not care about Team 7, they can explore new story directions and character interactions that wouldn't be possible in the canon story.
One reason could be to explore Naruto's character independently. Without the focus on his relationship with Sasuke, the writer can delve deeper into other aspects of Naruto's personality, like his dreams for the village, his relationships with other characters like Kakashi or Iruka. It's a way to break free from the over - emphasized bond in the original story.
Well, it could be that the fanfiction is set in a very different universe where Naruto has different upbringing or experiences. But this is quite a stretch because Naruto's caring side is so deeply rooted in his story. It might also be that the writer is simply trying to create shock value by presenting such a counter - intuitive view of Naruto. But in general, it's not in line with the essence of Naruto as we know him from the original series, and it might be a bit of a gimmick to make the fanfiction stand out in a sea of more traditional Naruto stories.
It could be that she has some past trauma related to Naruto's birth or the events surrounding it. For example, if she had a difficult pregnancy or if there were some threats to Naruto's life right from the start that made her distance herself out of fear. Another possibility is that she is under some sort of mind control which makes her act as if she doesn't care.
One possible reason could be a misdirection in his goals. If in the fanfiction he is overly focused on proving himself to the village, he might think that family is a distraction. So, he starts to distance himself from his family to concentrate more on getting recognition from the village.
Naruto could become more self - centered. Since he no longer has the overarching goal of protecting Konoha, he might focus more on his own needs and desires. For example, he could pursue personal power or adventure without considering the implications for the village.
It could also be due to some sort of mind - control or curse. In the Naruto universe, there are many powerful jutsus and dark magics. Perhaps an enemy has cast a spell on him that makes him not care about his own life. This would be a dangerous situation as he could be easily manipulated into dangerous situations without self - preservation.
One possible reason could be that Naruto has had some past experiences within the team that made him feel betrayed or let down. Maybe there was a mission where he thought his teammates didn't have his back. Another reason might be that there are secrets among the team members that Naruto has discovered, and these secrets make him question their loyalty. For example, if one of his teammates was hiding a connection to an enemy, Naruto would naturally start to lose trust.
One reason could be the author wants to create a unique and edgy story. By making Harry Potter not care about anyone, it's a complete subversion of the well - loved character. It grabs readers' attention.
One possible storyline could be that Naruto has faced so many disappointments that he decides to isolate himself from the Hidden Leaf Village. Maybe he feels betrayed by the people he once trusted, like some of the village elders. He might then embark on a journey alone, exploring new lands and meeting different shinobi cultures.
Maybe the writer wants to explore a darker or more alternative version of Naruto. It could be a way to break the traditional view of his character and see how the story would unfold if he was cold - hearted.