It probably will still provide some "payment" back, as long as some control is allowed for the grid operator.
At the moment they're happy with "charge any time between these hours", once everyone starts doing it it'll probably be "free if you leave your car plugged in and let us decide when and how much to charge".
Shifting demand has a price and they'll pay that to the users that help them achieve it in some form or other.
After all, if you don't charge it then, they'll need to provide the power later when it could cost them many multiples, it's just good business sense.
At the moment they're happy with "charge any time between these hours", once everyone starts doing it it'll probably be "free if you leave your car plugged in and let us decide when and how much to charge".
Shifting demand has a price and they'll pay that to the users that help them achieve it in some form or other.
After all, if you don't charge it then, they'll need to provide the power later when it could cost them many multiples, it's just good business sense.