Believe it or not, Sony does not own Insomniac Games. It only appeared that way since many games from Insomniac are Sony exclusives. There won’t be anymore exceptions to this rule, because Insomniac is officially part of PlayStation Worldwide Studios.
Sony has locked down a premiere developer. Insomniac had a monster hit with Spiderman on the PS4. Imagine what they can do with Spiderman 2 on the PS5.