A question about usage of common mode chokes for USB cables
The chokes used on most cables, including USB cables are placed there to keep the cable from being used as an antenna for RF signals that come out the equipment that the cable is attached to. 

There are other types of chokes used such as pictured below that are molded inside plastic on the cable.



(Picture Source: https://www.amazon.com/Tripp-Lite-Hi-Speed-Ferrite-U023-003/dp/B008VOPCGY)