It would be incredibly stupid for MS to make CoD an xbox exclusive and completely misses the business case for buying Activision in the first place.
Remember, MS is in business to make money, not to win the console wars. Buying the CoD (etc) IP at an inflated price and then immediately cutting off more than half of the revenue would be so mind-boggingly stupid, almost to the point of malpractice. This is why they really don't even need to be forced into saying they'll maintain it for 10 years on PS.
It's all about moving gaming to a recurring revenue model. So you don't care about if the consumer made a one time purchase of your console (in fact, you might even prefer they didn't if you're losing money on each one!), but you do care about the fact that they're playing your games.
Ben Thompson put it better than I could:
> Notice that this is for games that are purchased, and keep in mind that Microsoft’s goal with the Activision acquisition is not to gain exclusive games to sell but rather games to subscribe to. As I’ve argued the only way this acquisition makes sense is the extent to which it makes possible a new business model for gaming; simply buying exclusives via established titles like Call of Duty would be hugely value destructive.
>What is notable about Microsoft’s subscription push is that it aligns the company’s Xbox division with Microsoft’s overall push towards cloud computing and subscription services. What is interesting to consider are two questions:
>First, would Microsoft have ever gone down this path absent the investment in its original (failed) Xbox strategy? I would argue the answer is no; this is a reasonable leveraging of Xbox assets, but I do wonder if Microsoft could go back two decades if they would even bother.
>Second, if regulators were to kill this deal (Microsoft still needs approval from the UK and the US) would Xbox be long for this world? It’s hard to see how the division makes sense if Microsoft has the current business model dictated to them, given just how dominant Sony is with said business model.
https://stratechery.com/2023/uk-blocks-microsoft-activision-... (paywalled)