One consequence could be a divide in the fan community. Some fans who love fanfiction might feel alienated. They might see this as a lack of acceptance of their creative interpretations.
On a positive note for the official franchise, it might reinforce the integrity of the original story. By not forgiving fanfiction, it sends a message that the official version is the 'true' and 'pure' form of the Harry Potter story, which could potentially boost sales of official merchandise and new official releases related to the series.
One consequence could be that the story takes a different turn. Instead of the typical heroic plot, there might be a more character - centered exploration. Others around him may have to step up and fill the void. For example, his friends might become the heroes instead.
He could be seen as an enemy. SHIELD might not take kindly to someone with Harry's potential abilities refusing to join them, and they could view him as a threat. This could lead to them trying to keep an eye on him or even take action against him if they think he's up to no good.
For Harry, he may face a lot of criticism from his friends and the wizarding community. They might see him as a heartbreaker or someone who doesn't value his relationships. This could lead to a strain on his friendships, especially with the Weasley family who he is very close to.
One reason could be copyright issues. The creators of Harry Potter own the rights to the characters and story, and fanfiction often uses these without permission.
One possible reason could be that fanfiction often takes creative liberties with the original story and characters. Harry Potter might be seen as a very personal creation of J.K. Rowling, and she (or in this case, the fictional Harry Potter) may not want it to be distorted in fan - made stories. Fanfiction can sometimes change the essence of the characters or the plot in ways that go against the original vision.
For fans, it means a loss of creative outlet. Many fans enjoy writing fanfiction as a way to explore the 'Harry Potter' world further, so they are disappointed. For example, a fan who had an interesting idea about a side story for Hagrid can no longer share it in the form of fanfiction.
For fanfiction writers, they may have to stop writing and sharing their works. Some might face legal penalties if they are found to be in clear violation of copyright laws.
On the other hand, for the official Harry Potter franchise, it might lead to a more focused brand image. Without the plethora of fanfiction, they can better control how the story and characters are perceived in the public eye. However, it also means losing out on the potential buzz and fan engagement that some positive fanfiction could have generated.
It could mean that the official Harry Potter brand or those in control of the intellectual property don't support or condone fanfiction. Fanfiction often takes existing characters and settings and creates new, unlicensed stories. Maybe they see it as a violation of their creative vision or copyright.
Voldemort is an obvious one. Given all the destruction and death he has caused, it's very likely that Harry would never forgive him. His actions led to the loss of many innocent lives, including Harry's parents.