I'm guessing that the developer has to pay for them. The chance of those being freely provided by Microsoft = dick all, so it's not guaranteed that every game will have it. It's also clearly not an Xbone specificfeatureas Titanfall uses them for both the X360 and PC version as well, which makes it much less of a Xbone perk. Theoretically a developer could also rent out their Azure servers for a PS4 version of a game too.
I think their whole "30,000 magic xbox cloud servers" shit was just smoke and mirrors bullshittery for saying that they beefed their Azure capacity way the fuck up, which is for far more than just Gaming.