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.
In many Avengers fanfics, Spider - Man's sacrifice can be a very powerful plot point. It often shows his selfless nature. He might sacrifice himself to save his fellow Avengers or the world from a great threat. This kind of sacrifice also adds depth to his character as it shows his growth from a young hero to one who is willing to give everything for the greater good.
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.
The placement of the Avengers in Iron Man 3 fanfiction can be all over the place. It could be that they show up to assist Iron Man, or they might be off on their own missions and only mentioned briefly. It all comes down to the imagination of the fanfic writer.
Spider-Man has indeed joined the Avengers in the comics. This addition brings his unique skills and personality to the group, adding a new dynamic. His presence has led to some exciting storylines and team-ups.
Definitely. Ant-Man and the Wasp are integrated into the Avengers story. Their powers and actions contribute to the ongoing conflicts and resolutions in the MCU. Plus, they often team up with other Avengers in various events.