I think another major contributor to Fortnite’s success is the scale of cross-platform play that we’ve rarely seen before. Chances are if you have a thing that can connect to the internet, that thing is capable of running Fortnite.
They’re like Facebook not just because they have the money to steal any concept and build it in house, but because in some ways they are a social network. It’s as much as a game as a platform to hang out with your friends and chill.