I mentioned the reason above. Unlike Tesla, not all vehicles than can use their chargers have the charge port in the same place on the vehicle. Here's what their
web site says about it:
"The dual charging cables are not designed to charge two vehicles at the same time, but rather to easily reach your car’s charging port—no matter where it’s located. If either connector is in use, look for a different open charger. Most Electrify America locations will have four or more chargers at a station."