Question: Could ford one day be denied access? I know there is a physical adapter, but could a certain mercurial billionaire one day decide to restrict access via software?
https://www.carscoops.com/2023/09/tesla-owner-loses-supercha...
That Tesla didn't fix the issue until a news crew contacted them is an indictment of Tesla's customer support, not some sort of fickleness where they gleefully disable supercharging for random cars.
Edit: The parent comment originally said "They block access to current Tesla owners for no reason."
Having said that, I think this actually solves some problems for them in the long run. I doubt they'd have any interest in limiting access.
Similarly, these NACS equipped vehicles can use any open NACS station, or any open CCS station via an adapter. There is nothing in the standard that limits charge station providers to only Tesla.
Any charge station (whether CCS or NACS) could implement restrictions in any way that they see fit. The most common cases of this are CCS stations at dealers, where they often restrict it to their company's vehicles.
It is unlikely that a public charge company would want to cut themselves off from revenue by severely limiting who could use their site.