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Apple was able to strike off the success of the iPod and get all the major players on board when they launched the iTunes store, but that was long ago when people were fairly clueless about where things would go. I'm sure the music labels would like to have a do-over
Record labels have lower market share (64%) and it is much more practical for you or I to go record in a studio and then distribute on Spotify than for either of us to make a film. Market is more fragmented and thusly lends itself more easily to marketplace distribution.
