Cod sells the most on playstation. MS likes money. It's straightforward hehMS doesnt like money, they have money, they have more money than some countries do.
What MS likes, and always has liked, is power. You wouldn't throw 70 billion away for games youre already getting if you like money. MS likes power over the consumer, power over partners, and power over competitors. Its their business model, always has been since the early days Windows released and they used tactics to regain a monopoly.