Subway Surfers is an endless runner mobile game, which means it doesn't have a specific ending. The goal is to run as far as possible while avoiding obstacles and collecting coins.
Call of Duty Warzone is a free to play game. It's not on GamePass and it doesn't need Xbox Live Gold either. MW2 and its multiplayer component is not free. You need to buy it if you want to play the single player game or MW2 multiplayer.