Found a way to play Modern Warfare 2 for free through Warzone 2
Reddit user Menjac123 said that he was able to launch the Call of Duty: Modern Warfare 2 story campaign without buying the game itself. To do this, he took advantage of the Warzone 2 clients and MW2 itself, placed them in the same folder, and with the help of a third-party program managed to launch a single player game.
We do not recommend using the Menjac123 method - for this you can get an eternal blocking of your account.
The gamer's method was used by another user under the nickname iamartorias69. He stated that he went through several story chapters and did not encounter any problems. However, the blocking may overtake him a little later, when the problem will be noticed in Activision. If many unscrupulous players get access to the story campaign, then someday the shooter developers will definitely take on them.
Interestingly, gamers use the method not only to complete the single-player campaign, but also to get various items such as weapon skins and kits. Because of the bug, they can get to those gamers who did not buy them.