The US Department of Justice and 16 state and district attorneys general accused Apple of operating an illegal monopoly in the smartphone market in a new antitrust lawsuit. The DOJ and states are accusing Apple of driving up prices for consumers and developers at the expense of making users more reliant on its iPhones.
They don’t have to force them to make an app. Instead they could make them provide an interface that an app can use. Instead of their current strategy of thwarting any attempt to make their ecosystem interoperable with competitor’s devices. I imagine them instantly killing Beeper’s connection to iMessage was a part of this move.