Since the parking fee of the Tesla Supercharging pile is free, some owners who are not in a hurry to use their cars will park their cars there and charge them at will, using the charging pile as a parking space. Even if the car is fully charged, it does not go out, and it stops for half a day, resulting in the owners who really need to be unable to charge.
In addition, the sales of Tesla cars skyrocketed in 2016, the phenomenon of supercharging queue became increasingly serious, and the free supercharging strategy increased the pressure on the supercharging network. So the strategy of using fees can relieve some of the pressure.