Last year when it was rumored that there would be an HD remastered version of Call of Duty 4: Modern Warfare fans of the series rejoiced and got excited, but then the Activision dropped the Call of Duty: Infinite Warfare trailer which revealed that you could only get Modern Warfare if you bought the $80 Legacy edition of Infinite Warfare and that Modern Warfare would not be available to purchase by itself.
Fans were undoubtedly pissed by this and the trailer received millions upon millions of dislikes. So Activision not to be one to take bad publicity lying down, they decide to double down on pissing off their fan base. They decided with the remaster of Modern Warfare that it would not include the DLC from the original release, which is pretty standard for remastered releases (see Borderlands, Bioshock, Uncharted, and so on) but not for Activision. Not only that, the DLC for Modern Warfare is not included in the Infinite Warfare Season pass and costs $15 dollars which is $5 more than it originally cost. What are you doing Activision?
To top that off there is only about 800 Modern Warfare players playing this game on a daily basis, so good luck finding a game with your $15 DLC.