Any source for this? The Supercharger network is no longer free (at all for Model 3, 400 kWh in annual credit for Model S/X), but either way it was and still is

Any source for this? The Supercharger network is no longer free (at all for Model 3, 400 kWh in annual credit for Model S/X), but either way it was and still is a heavily marketed feature of Tesla vehicles so you can't ignore the cost. They need to make money or they will go out of business.