Male USB-A to male USB-C cables are allowed, what's not allowed is male or female USB-A or USB-B to female USB-C. That is, on a USB-C to legacy cable, the USB-C

Male USB-A to male USB-C cables are allowed, what's not allowed is male or female USB-A or USB-B to female USB-C. That is, on a USB-C to legacy cable, the USB-C end is always male.