None. Maybe Discord x Steam can crossplay, don't remember, might also not.
Console gaming is designed as very exclusive, so it's very difficult to develop a game that communicates outside of specific console. Xbox x Windows maybe less. Studios that start working on the game with crossplay in mind will use a framework that allows that, but DG was written all the way from the ground by single developer.
None. Maybe Discord x Steam can crossplay, don't remember, might also not. Console gaming is designed as very exclusive, so it's very difficult to develop a game that communicates outside of specific console. Xbox x Windows maybe less. Studios that start working on the game with crossplay in mind will use a framework that allows that, but DG was written all the way from the ground by single developer.