This is untrue. Sony expects to receive payments if there are purchases made outside their ecosystem that expect to be used in their ecosystem. For example, if a Fortnite player primarily plays on PS4 but goes on PC and buys a few skins and then goes back to playing on PS4, Sony has missed out on the sales while being the primary ecosystem for that player. They expect to receive some of that money from the PC ecosystem. MS and PC don't have these concerns because they aren't a large part of the Fortnite community like Sony is. As the leader, Sony is the one who risks losing income from allowing anybody to play anywhere and share ecosystems, including microtransaction products that are cross-platform.
