https://www.techradar.com/news/former-sony-online-boss-says-fortnite-cross-play-issue-is-down-to-money

While a lack of console cross-platform play has long been an issue for fans of gaming, it feels like it’s really come to a head recently with Fortnite Battle Royale. As Xbox and Nintendo tweet one another to organize games of Fortnite, PlayStation remains on the sidelines as the platform that refuses to enable its users to play with anyone else. 

Sony has been rather evasive when it comes to explaining its reasoning for its reticence. Xbox and Nintendo seem to have no problem with it, and Epic Games has said turning on cross-play would be as easy as pressing a button. Yet PlayStation won’t get in on the act.