No greed here. Apple is making this so the argument that they get money for lightning cables is irrelevant. The phone uses lightning. It would be weird if the battery pack used something else.

You can make an argument that Apple should switch their phones to USB-C but they seem to be heading toward a cable-less solution instead. If they were to change to USB-C tons of people would scream that Apple were doing this just to sell new cables. That is exactly what happened when they switched from the 30-pin connector to lightning. I would like to see them switch on the Pro model phones, at least. That market is likely more ready to switch.