The first point of trouble with USB-C is cost. The USB logo itself is copyrighted and requires a fee for any commercial use. The method of constructing a cable costs on average 5 times more to manufacture than a micro USB type B in money and time.
Secondly, Apple is not onboard with the use of USB-C when tech power house Apple which controls over 5% of worldwide computer sales and a quarter of cell phone sales. Currently Apple gets a $4 royalty from every Lightning cable manufactured and sold. [source]
Lastly, because of the cost to manufacture USB-C copycats have introduced shortcuts to the process by forgoing the USB-IF Compliance Program and cut corners on build quality. These shortcuts often allow for more wattage to be drawn from the cable when plugged into an older USB port on a desktop computer. Leading to the chance of damage to your computer or its USB port.
More detailed explanation of USB-C. How its made.