It's an open system because the numerous and ongoing attempts to make it a closed system have been unsuccessful because users don't like that. Spotify and Stitcher are the most recent attempts to secure tons of exclusive content behind an app gate or a paywall.

Even if this app is successful beyond OP's wildest dreams it's going to take 1% of the market or whatever -- the idea that this is going to cause a sudden shift in business strategy, and that that shift will be in favour of proprietary apps in a way that people aren't trying now, beggars belief.