Don't get me wrong, I don't think USB C is perfect nor that it would have been my choice. In fact, from a mechanical standpoint, I prefer Lightning.
What I'm saying is that Apple didn't have to take a cut from every item sold by 3rd parties who wanted to use their specs.
They could even have sold the spec at a fair price but instead they went on a full rent-seeking strategy.
This is why, when there is chatter about Qualcomm/Apple feud on licensing, I laugh my ass off because this is exactly the same behavior they impose on their partners. Can dish it out but can't take it. My complaint is mostly about the hypocrisy of Apple's behavior.
But the real motivator was making as much money as possible, the fact that their specifications had some desirable qualities is nice but not very relevant (since you don't get a choice if you wanted to make an iThing accessory anyway). Their previous port (30-pin) had the same problem and it was rather terrible.
I had the first iPod with FW400 and they could have very well gone with mini-USB when they switched to their 30-pin to make it compatible with most PC who mostly had USB 2 and rarely FireWire. I used mini-USB for plenty of things from external hard-drive to digital cameras passing by digital mini-disc players and it was a fine port.
Yet they chose to make their completely proprietary 30-pin port, to rent-seek as much as possible on the accessory market. When they switched to Lightning, the goal was exactly the same, trying to pretend it's because it was better is disingenuous and very ignorant of Apple's history and behavior.
Plenty of corporations do things like that but the difference is that with Apple there is an army of zealots eating the bullcrap and justifying their behavior in a fanatical way.