Perhaps there is some sort of power or technology that Spider - Man has that the Avengers believe is too dangerous to be in his hands. They might think that they need to take it from him for the safety of the world, even if Spider - Man has no ill intentions.
Another possibility is that the Avengers are being manipulated by a villain. The bad guy could be using false information to make the Avengers believe that Spider - Man is a danger. So they go after him without really knowing the truth.
He would probably try to avoid them at first. Spider - Man is used to being on his own and fighting his own battles. He might use his agility and web - slinging skills to escape from the Avengers.
One reason could be a misunderstanding. Maybe some events were misinterpreted, and the Avengers thought Spider - Man was involved in something bad. For example, if there were some crimes that seemed to have Spider - Man's fingerprints all over them, but in reality, he was being framed.
One possible reason could be a misunderstanding. Maybe the Avengers think Spider - Man has been compromised by some sort of enemy influence. For example, if a powerful villain has the ability to control minds and they suspect Spider - Man is under that control, they would try to capture him to protect the world and also to try and break the control. Another reason might be that they believe Spider - Man has some information that is crucial for saving the world but he's being uncooperative, so they resort to capturing him. It could also be that there's some sort of new law or regulation in the superhero world that Spider - Man is unknowingly breaking, and the Avengers, as the enforcers of a sort of superhero code, feel they need to bring him in.
Spider - Man could use his agility and web - slinging skills to escape. He could swing between buildings, making it difficult for the Avengers to follow him. His small size compared to some of the Avengers also gives him an advantage in hiding in tight spaces.
In the fanfiction, it could be that Spider Man has a personal vendetta against one of the Avengers members. For example, if one of them had a past with a villain that Spider Man has a strong connection to, like if an Avenger unknowingly helped the villain in the past, Spider Man might transfer his hatred for that villain to the Avenger and by extension, the whole team.
One possible reason could be a misunderstanding. Maybe Spider - Man is framed for a crime he didn't commit, and the Avengers, being the protectors of the world, believe the false evidence against him. For example, a powerful villain could have planted evidence to make it seem like Spider - Man was involved in a large - scale attack on a city. Another reason could be a difference in ideology. If Spider - Man starts to take actions that the Avengers think are too extreme or irresponsible in his fight against crime in New York, they might decide to hunt him down to stop him from causing more potential harm.
It could be due to a mind - control device. Some evil force might be controlling the Avengers and forcing them to torture Spider - Man. This would add an element of helplessness to the story as the Avengers are not acting of their own free will. Another reason might be a deep - seated jealousy within the Avengers. Perhaps they feel that Spider - Man is getting too much attention and they want to put him in his place, which is a very dark and out - of - character take but possible in the realm of fanfiction.
The plot might involve Spider - Man getting into some trouble in New York and the three Avengers coming to his aid. It could be that a powerful alien artifact has been stolen and Spider - Man accidentally gets blamed for it. The Avengers then step in to help clear his name and find the real culprit while also protecting the city from the potential danger of the artifact.
Yes, Spider-Man has been featured in the Avengers comics on multiple occasions.
Spider-Man has definitely been in the Avengers in the comics. His presence has added a fresh dynamic and his powers and wit have been valuable assets to the group.