Exactly. If duplicating a service is grounds for rejection and expulsion, then what is a company to do when Apple moves into a new market? Should the New York Times not have a newspaper app now that The Daily has been endorsed by Apple? Should Google Maps close up shop when Apple gets around to implementing navigation? Maybe Foursquare should pack it up once Apple adds check-in support to the base OS.

All snark aside, it's never a sound business model to hand a possible competitor the "off" switch for your business.