From this recent article on the recent Tesla Supercharging Transfer offer - "There are still today a few hundreds of thousands of Tesla vehicles with unlimited free Supercharging around the world. At some point, Tesla said it was paying about $20 million yearly to support owners on free Supercharging."
Tesla tries to boost sales by offering free Supercharging transfers to new orders
Tesla is attempting to boost sales by convincing owners of older Model S and Model X vehicles to upgrade by...
electrek.co