The heat is being dialed up on Sony over its wildly unpopular stance on Fortnite cross-play. As you know, Fortnite is cross-platform capable, and is available to play on the PlayStation 4, Xbox One, Nintendo Switch, PC, macOS and iOS.
PlayStation 4 gamers are able to play against those on the PC, macOS and iOS, but are prevented from joining

Source: Hot Hardware – Sony’s Fortnite Cross-Play Ban Is A Dumb Money Grab Says Former Sony Online Exec