https://www.gamespot.com/articles/fortnites-cross-play-beta-is-now-live-on-ps4/1100-6462058/

After months of resisting cross-play, Sony has finally given Fortnite players on PS4 the ability to play with those on other consoles. The platform's cross-play open beta is now available, just in time for Season 6 (now live), enabling "gameplay, progression, and commerce" in Epic's massively popular battle royale game across PS4, Xbox One, PC, Nintendo Switch, and mobile devices.

This move marks a dramatic reversal in Sony's stance on cross-play. The company has come under fire over the past few months for not allowing Fortnite players to play with and share their progress across platforms, despite that functionality being available in other versions of the game. Sony's response to the issue was that PS4 was simply the best place to play, suggesting that there was no need to allow cross-play with other platforms, but fans and other video game industry leaders were unsatisfied by the company's answer.