Challenge to budding scriptwriters...
Your challenge:
i. How would you set up/ explain Spider-Man in the Sony Spider-verse?
ii. How would you write him out of the MCU?
My suggestions:
i. The first Sony Spider-Man movie opens with Tom Holland -- already established as Spider-man, no origin story needed again at this point, thank you -- waking up and telling his aunt that he had another one of his really weird dreams that he was part of this bigger group of superheroes -- no specific names mentioned.
In fact, he would wake up to the sound of J. K. Simmons as Jonah Jameson spouting off about Spider-Man on the TV in the background. This would make a natural segue from 'Far from Home'. (I assume Sony owns Simmons, portrayal contractually since he originated on their side of the house.)
His aunt explains that his strange dreams are probably due to residual anxiety from the death of his uncle a year ago, and from being a lone superhero. She would point out that since the death of his uncle he has had no father figure, or mentor, to guide him -- an oblique reference to Iron Man / Tony Stark without dropping his name.
Here's the humour though... every character in this new universe... May Parker, MJ, etc... looks almost identical to the actors who played them in the MCU. Something of an inside joke. Sony would do a search to find suitable actors.
ii. On the MCU side, they have it much easier. The end-credits scene where Spider-Man's identity was openly revealed gives them an easy excuse to explain his absence. 'He had to go into hiding to protect his family and friends'... a sort of superhero witness protection plan, maybe by faking his death. Furthermore, he was overwhelmed by the enormous pressure of having to live up to Tony Stark's expectations of him, and he needed a break from the world-threatening stuff.
A quick scene with Nick Fury, or Happy Hogan, referencing him only as 'the kid' -- again no explicit name dropping although we all know who he's talking about.
This also allows the character to re-enter the MCU at some future point with minimum issues.
Any takers? Studios might be reading this stuff, you never know...