Many months ago when Xbox One players were expectantly waiting for Rocket League to launch, we heard that the game would not support cross-play between Xbox One, PC, and PlayStation 4. Sadly, the reason ended up being Sony’s restriction on PlayStation Network and Xbox Live being able to link. Sony’s restriction came up recently with the developers of Tekken 7 and cross-play questions.
it's NOT my heart & our issue.
It's 1st Party issue & platform security policy issue.
Remember, SFV & KI is Exclusive PS4 or X1 @Jenny_Cage
— 水瀬 伊織 (@Harada_TEKKEN) March 5, 2017
On Twitter, Tekken’s Game Director and Chief Producer Katsuhiro Harada was asked if the team will “have a change of heart and make Tekken 7 cross-platform compatible with PC.” Harada responded, saying “It’s NOT my heart & our issue. It’s 1st party issue & security policy issue.” Harada followed up, briefly explaining that Sony’s cross-platform capabilities with PC are facilitated through a peer-to-peer, or P2P, connection method for security reasons. These restrictions are not quite how Xbox Live works, and Harada notes that they “[c]an’t split PC” versions of the game to be Xbox Live-compatible as well as PlayStation Network-compatible because of that security policy.
ICXM notes that the security policy is oddly named, as “Microsoft’s servers are more secure than Sony’s” and “that’s a joke” of a reason to bar true multi-platform online multiplayer.