The Blackberry proposal could be rephrased as "API Neutrality". A classic example would be email protocols. Neutral APIs would enable best-of-breed apps which support more than one API/service, improving usability and choice for consumers. Platform owners would be free to optimize integration between their platform and backend, but could not exclude clients from competing platforms. They would not be obligated to support competing services, but users would then have the option of switching to a multi-service client app.