Fortunately, Warzone (in every capacity) is totally free to play across PlayStation, Xbox, and PC platforms  it's also a crossplay title, which has served to unite cross-platform players.

Call of Duty: Warzone\n\n Play now for the most exciting and best-supported video game experience around. Why should I play it? Building off two decades of FPS pedigree, Warzone!" 2.0 is a free-to-play experience that thrives within Call of Duty's iconic history and universe.