Good article. Podcasts still have a 'Web 2.0', pre-Facebook ethos: there's a feed, and there are software clients that check the feed and get a direct link to the mp3 file. Personally, I want to make a site that archives podcast episode listings, and guess what? If I have the time and energy, I can make it. Getting the data--new episodes, episode descriptions, cover images--is not an issue. The more that top publishers want Apple to introduce tracking, revenue sharing, etc. the more all related data would get centralized, and as Marco points out, in the long run podcast publishers might start resenting Apple for becoming a major intermediary, the same way online publishers resent decisions made by Facebook.