Sure. At the same time it is all of the content on Apple's own iTunes servers that gives value to those servers, and Apple uses that value to sell more hardware. Are podcast creators getting a cut of that? If not, then why might they think that business model is fair?

Edit to reply to below: that has been the case for the download model. How certain are you that this is still the case for the streaming model of this app? Have you sniffed the traffic?