It's a 10 year deal. Sony can use that decade to invest in its own shooters like they used to with Killzone.

Sony refused to allow cross play for years, effectively making you buy a PS to play with your friends. They took cross platform MMOs like Destiny and made entire parts of it exclusive, stealing what should have been available to everyone who already paid.

Meanwhile Microsoft makes their stuff available on Steam, has nearly-full backcompat going back two decades, and gives me a path to play my games on phone.