And I'm curious — really asking not being passive agressive — do you see an iOS app developed by an independent developer as belonging to both the developer and to Apple?
I'd say that Apple's 30% is a commission based on the sales and service they offer, and yes it's worth it...especially given the market position and the fact that there's verification of IP ownership, etc. But in the end the app itself belongs to the creator, just as the music belongs to the artist (or label, depending on the deal.)
Seems a bit like perspective, but it goes deeper: if the music belongs to the artist who created it then they should have the right to pull it from a service and expect reasonable effort to keep it out of the service — YouTube's content ID does a commendable job. (Though it is abused by some of the majors...but the algorithm itself is really solid.)