No the regulation is that all chargers use USB, the other end of the cable doesn't matter. The situation that arose out of that is that you can charge pretty much any phone with any USB charger, which was the intent.

I'd like Apple to have chosen a USB standard for the other end of the cable, however to be honest, the lightning connector and it's counterpart look a lot more robust than USB-C or micro/nano USB. USB-C is also quite a bit bigger than lightning. So perhaps some day we'll see USB adopt lightning as a standard if that is at all possible. iPad Pro lightning supports USB3 speed, so we know lightning can do USB3.