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Since the release of Call of Duty: Modern Warfare II, bugs of various sizes have been found in the game quite often, but the latest find surprised absolutely everyone. Gamers managed to find a vulnerability in the shooter client that allows you to launch the story campaign even if you did not buy the game. All you need for this is to download the free Call of Duty: Warzone 2.0 and manually replace some files.
Call of Duty: Modern Warfare II hack method shared user under the nickname Menjac123. According to his instructions, you need the latest version of Call of Duty: Modern Warfare II (non-cracked files available for download from free sources) and Warzone 2.0. You will also need unlockers such as Greenluma and Koalageddon. After that, you will need to replace some libraries, as well as shooter files. If all the manipulations are done correctly, the Call of Duty: Modern Warfare II story campaign will be completely free to play.
As noted in the comments, the reproduce method does not always work, but it still works.