Apple already had their standard before there was USB-C. Do you think yet another port migration would be well received ?
I'm talking about the ability to walk off an airplane, in any country in the world, and having forgotten both my charging cable and my charger, I can find a plain old USB port somewhere[1] and someone (possibly my hotel) can hand me a plain old USB cable and I can charge my (device).
[1] On my own laptop, preferably.
Also, hotels have cables.
Yes, there are parts of the world where the above does not hold, but did you really mean ANY country in the world?
At least they succeeded in being popular enough to be practical.
Which is to say, this may very well be true, but the lack of third-party devices with lightning ports can also easily be explained as just nobody wants to do that.