Microsoft reveals Sony is blocking Fortnite PS4 vs. Xbox One cross-play - The Verge

PS4 and Xbox One gamers will only be able to play Fortnite against PC, Mac, or mobile and not against each other

PS5 And Next Xbox Cross-Play Doesn't Have The Right Mood Among Big Studios, Says Tannenberg Dev

Microsoft says they are working with Epic on possible Fortnite Cross Play for Xbox One - Fortnite INTEL

What are the gaming consoles of the future? - Quora

Sony Responds to Microsoft's Invite to Connect Xbox One and PS4 Networks - GameSpot

Sony Really Did Not Want Crossplay on PS4, Leaked Documents Reveal

Sony Really Didn't Want Fortnite Crossplay, Internal Documents Reveal

Xbox Boss Admits Microsoft Can't 'Outconsole' PS5

Cross-platform play - Wikipedia

Price aside, Sony's PS5 DualSense Edge is really good

Epic offered to make Sony 'look like heroes' in exchange for enabling crossplay in Fortnite - Neowin

NFT Gaming – the Future for Sony?

News - November, 2020

Microsoft Intended To Release Xbox Game Pass On PlayStation, Sony 'Blocked' It