As we know that Spider-Man and X-Men is an alternate post-credit scene character of Iron Man’s, and this is proof that how much changes are done in MCU phase 1 from the last 11 years when Robert Downey Jr. and Jon Favreau’s movie was released. Unintentionally the entire MCU will be kicked off.
After when a franchise’s culmination, Marvel ready to released an Avengers: Endgame and they realised that at one side where many groundworks are going out for introducing an Earth’s Mightiest Heroes, and the same team its reflect that they tease another web-slinging hero.
Many people are involved in making an Iron Man’s Set because that was a much-improvised set and which required a general narrative layout, the finer details of that movie were polished while filming and along with making an improvised set, a Marvel Studios also needed enough creative wiggle room for highlighting herself. And the Iron Man’s improvised set becomes a courtesy issue, and that was affected the Iron Man’s famous post-credit scene character.
Nick Fury, a famous person in Marvel studio, says that “as if Gamma accidents, radioactive bug bites, and assorted mutants weren’t enough,” and Nick Fury introduced himself as a newly Iron Man. And he also was talking about Bruce Banner/Hulk, Spider-Man and the X-Men. Nick Fury above words reflects that Marvel Studio started to searching a story based on the green-rage monster and Marvel Studio also explore and other characters of a superhero because most of the previous hero’s are owned by Sony Pictures Entertainment and 21st Century Fox.
Marvel Studio seriously thinking about that the alternate post-credit scene of Iron Man’s and in the present time Spider-Man and X men together come in MCU is more relevant to Iron Man’s alternative post-credit scene, and all this are done due to marvel studios and Sony Pictures Entertainment partnership.
Apart from this, you also thanks Disney’s Acquisition of Fox that the mutants and the Fantastic Four are a tie in characters under the same umbrella.