The U.S. Department of Justice and 15 states filed an antitrust lawsuit against Apple, which is still ongoing.
Third-party smartwatches like Pebble face various disadvantages on the iPhone, such as the inability to send text messages or perform actions on notifications, additional restrictions on notifications display, and limitations on negotiating messaging services with carriers.
Apple's policies hinder the development of alternative smartwatches and limit the integration of other devices with the iPhone.
Integrating other devices and promoting competition would benefit Apple's customers in the long run.