Earlier quoted context omitted.
Literally made the same decision last night for a rental. I had no idea how to charge an electric car and did not want to have to deal with figuring it out on top of everything else. They charge you $25 if you return it not fully charged, which is bananas, because why couldn’t they just plug it in while they’re cleaning the car? It’s not like gas where they have to drive the car to a gas station.
You're likely going to spend more than $25 to put gasoline in your rental before returning it, and $25 is the approximate cost for a supercharger, so that charge seems very reasonable. You could have just taken the electric car and returned it empty.
It's likely similar where if you receive it at 100% and return it at 98% you're getting charged the full $25. It's just another revenue source for the company.