Sold more than many games on xbox+PC combined. Now that's an even bigger install base. Wake me up when lucky's tale, cuphead, forza 7 etc crosses 2.5 million on xbox+PC
"Fortnite is multiplatform. So how is this a win for ps4 again?"
How is it not? There are 60+ million PS4 owners out there. Not all of them have multiple platforms. Fortnite or any other AAA dev can easily take advantage of absence of any battle royale style game on PS4.
You don't think bluehole would like to have a piece of those 60 million owners? Of course they do, just like any sane business would do. But if somone else can beat them to...