Q7
We know that Strive will have crossplay between PS4 and PS5, but we don't know whether PC will join in to create a unified playerbase. Members of ASW have stated that they want crossplay to become a standard going forward, so what is Team Red's feeling and current situation on PC/PlayStation crossplay in terms of Strive?
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We’ve received a lot of requests from the players regarding implementing crossplay between the PC and console versions.
However, there are many problems that need to be overcome before it can be added to the game. At this time, we’ve decided not to implement crossplay on release.
We are, however, looking into implementing it in the future. I hope you can support the game as we work towards crossplay implementation.
Source : https://www.guiltygear.com/ggst/en/news/db4/
Donc crossplay entre PS4 et PS5 oui mais PC non, en tout cas au lancement 
Bon en soit c'est si ça arrive au moment où le jeu commence à se désengorger de ses joueurs c'est pas plus mal.