Very very few AAA games today are only made for one platform with the exception of paid exclusive agreements and in-house studios.
It's not that hard to ship cross-platform games nowadays since Unreal and Unity come with support for everything under the sun.
The more platforms developers can ship to, the more revenue they can make. Customers today play on a variety of platforms.
Today, it's not unheard of for a big game to ship for: Xbox One, PS4, PS5, XSX, XSS, PC, Stadia, Switch, Geforce Now. That's 9 platforms. In the near future, if you ship a game for the Mac, you get a market that is 50% of yearly sold gaming computers. You might also get iPad, and whatever gaming console Apple has been rumored to make, support with little to no effort too.
Heck, even Sony is releasing games on Windows.
Former PlayStation-only titles Horizon Zero Dawn, Death Stranding, and Days Gone have proved very popular on the PC, and Sony has all but confirmed that Uncharted 4:...
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