Another reason could be for the sake of creativity. Writers love to take existing characters and put them in new situations. In this case, the situation of Bella moving on from Edward is a great opportunity to explore different emotions, relationships, and storylines. It can also attract readers who are interested in seeing a different side of the Twilight universe, especially those who might have been a bit disappointed with how Bella was portrayed in relation to Edward in the original books.
People might write this kind of fanfiction because they feel that in the original story, Bella was too focused on Edward. So they create these stories to give Bella a chance to be more independent. They want to show that she can have a fulfilling life without him. For instance, she could focus on her studies, or pursue her own dreams like becoming a writer or an artist. This also gives fans a chance to rewrite the story in a way that they think is more empowering for Bella.
Some writers might do it to fill in the gaps in the original story. Maybe they felt that the kisses in the books or movies could have been more detailed or happened in different circumstances. By writing fanfiction, they can create the perfect kiss scenario for Edward and Bella that they always imagined.
It's a way for fans to add their own creativity to the story. Maybe they felt that the original Edward - Bella relationship was a bit too 'perfect' or 'safe' in some ways. By creating 'dark' fanfiction, they can introduce elements like danger, mystery, and more complex emotions. For instance, they might explore how a darker Edward would deal with his love for Bella, and how Bella would cope with a more intense version of him. This gives a whole new depth to the characters and their relationship.
Some writers might be disappointed with certain aspects of the original story. So they create fanfiction to rewrite parts they didn't like. For example, if they thought Bella was too passive in the original, they could write a fanfiction where she is more assertive in her relationship with Edward. Also, it gives fans a chance to play with the characters' emotions and relationships more freely.
Some writers are inspired by the intense love story between Bella and Edward. They feel the need to expand on it, add more depth, or change certain elements to make it more interesting to them. It's like taking a beloved toy and adding new parts to it. They can create new plotlines, introduce new characters, and build on the world that Stephenie Meyer created.
The 'Edward and Bella are mates' concept also adds a layer of mystery and magic. It makes their relationship seem more otherworldly and special. It gives fans a chance to see their favorite characters in a new light, with a relationship that is even more extraordinary than in the original story.
In some fanfictions, Bella might start a new relationship. For example, she meets a mysterious stranger who has a completely different personality from Edward. He is more carefree and fun - loving. Through this new relationship, Bella realizes that there are other types of love and connection in the world. This helps her move on from Edward as she builds a new and exciting life with this new person.
People write it because they like to explore different relationship dynamics. Jacob and Edward have a complex relationship in the original story, and a hug between them can represent a new level of connection that wasn't fully explored in the original. It gives writers a chance to play with their characters in a different way.
People like it because it allows them to explore the relationship between Edward and Bella more deeply. Their kisses are such an iconic part of their story, and fanfiction gives a chance to add more details and emotions to those moments.
People write 'bella and snape mates' fanfiction because it's an interesting and unexpected pairing. It allows for exploring new dynamics within the Harry Potter universe. It gives a chance to rewrite the relationships in a more creative way.
People write Jacob Black and Bella fanfiction because they are dissatisfied with the original storyline. Maybe they thought Bella and Jacob had more potential as a couple than what was shown in the Twilight series.