I assume that the reason for not making Lightning an open standard is that the thing on the technical level is really tightly coupled to iOS. On electrical leve

I assume that the reason for not making Lightning an open standard is that the thing on the technical level is really tightly coupled to iOS. On electrical level it is mostly an “two-lane” HS USB. USB-Lightning cable is basically wires, but other kinds of Lightning peripherals use weird protocols that are highly XNU/Darwin/iOS specific, mostly because that was the simpler implementation (looking at how things like AirPlay/CarPlay works show that Apple does not intentionally produce proprietary interfaces, but they use open standards as long as there are open standards and just invent the simplest thing when there is no applicable standard).