From the PlayStation Blog:
It’s never been a better time to be a spider-fan! The team at Crystal Dynamics, along with our partners, are overjoyed that we get to be a part of this hero’s gaming journey. We can’t wait for you to add Spider-Man to your Marvel’s Avengers roster in early 2021, and as we’ve promised before, he will be available at no additional cost to owners of the base game, exclusively on PlayStation.
Now, this makes enough sense from a business standpoint: Sony owns the rights to Spider-Man. And while they’ve recently shown a willingness to share this extremely popular IP with daddy Disney, it makes enough sense they’d want to keep him for themselves for this highly-anticipated triple-A game.
The Avengers game is set to launch September 3, later this year.