Spoiling a game is never ok unless it's pretty old and even then only when talking about the game in a constructive way and not just going out of your way to spoil it for people

Because if you'd played it you'd know you haven't got Modern Warfare for free and you just have Warzone

Warzone 1 has the same cover art as Modern Warfare 2019 and Warzone 2 has the same cover art as Modern Warfare 2, you won't have got Modern Warfare for free