exactly, as I understand it the main obstacle is billing, which is not standardised, and for Tesla's cars and superchargers is based on an identifier in the car

exactly, as I understand it the main obstacle is billing, which is not standardised, and for Tesla's cars and superchargers is based on an identifier in the cars that is linked to a tesla account. Even without a standardised connector and protocol it's fairly easy to make an adapter. (that said the standardised connector makes it easier to trial this in europe than in the US)