Earlier quoted context omitted.
Apple have a monopoly on the distribution of iOS apps, so they are required to offer fair terms to all app vendors, including themselves. Apple could charge themselves the 30% App Store fee for Apple Music, demonstrating that the App Store is a fair marketplace that doesn't artificially advantage Apple's own services. It would then be incumbent on Apple to prove that Apple Music is priced fairly, rather than being de…
NYT Newspaper also has a monopoly on distribution of ads on NYT pages, so should they charge themselves to put their own ads?
It's somewhat similar to net neutrality proposals. AT&T doesn't have a monopoly as an ISP. However, if AT&T starts/acquires a video streaming service, they should not give unfair advantages to their own service because they want to compete with Netflix.