Marvel Rivals blocks console and PC from playing together. Specifically because console has such a huge advantage with how gimped their controls are, and with the fact that they enable literal developer sanctioned cheats to help people have fun. Then there are keyboard + mouse adapters and you get the aiming of a mouse with a sanctioned aimbot.
Actually this is wrong cross play is enabled by default and the game will even warn you that you’ll have a harder time finding console only gamers to play with.
No, only quickplay, which is everything goes. Competetive is blocked crossplay.
Edit: I know because we tried it with people on xboxes and it didn’t let them compete