The original comment only listed bandwidth cost. Storage is also equally cheap, global distribution is equally cheap if you have your boxes at POPs. Someone that is at Apple's scale could very easily manage this.

We're looking at cents per app per user in lifetime costs.

The "Cloud" is disgustingly expensive at nearly any scale. It does require some capital investment and competent people to host your own however. Although there really is no alternative to the cloud if you are small scale but need presence globally.