1. Legal terms aside, yes, you *are* stealing charge from other batteries in the area.
It's a parasitic drain by definition. This is the same thing that happens when you charge your motorcycle battery off your car battery to get it to start - it's stealing charge from one to feed the other, despite the fact that you own everything involved. I also suspect that (as Matt2000 pointed out) charge/discharge cycles will be greatly shortening the lifespans of batteries so connected and that the cost of replacement will not be less than the amount you are getting paid to allow a parasitic draw on your car. Suggested further reading:
https://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_life
2. 'Dumb' or 'smart' use case doesn't matter. Knowing your car is only 80% charged ahead of time isn't going to be significantly different from coming out and noticing your car is at 80%. If you have to go anywhere other than just around the corner or down the block, you're going to want to charge up to 100% pretty quickly - the more so in cold or hot weather.
Air conditioning can cut 30% or more off of your range on an electric vehicle and
heating can cut it down even worse. Knowing this, if you want to drive a significant distance, your first stop is going to be to the local SuperCharging station... where you're going to put a nice fat load on the grid. This is already being demonstrated in California with the EV population out there.
3. You *still* have to put power back in the 'distributed storage units' called cars - if not immediately, then in short order. The point MWF and I are making is that this idea is a 'rob Peter to pay Paul' scheme that's
still going to require large generation capability and grid upgrades to ensure that a majority of your users have sufficiently usable charge levels should they want to go somewhere. Is the Netherlands going to invest in the rough doubling or quadrupling of the generation capacity in their country? Are they going to invest in the massive overhaul of their grid that these vehicles are going to require? (If you read the links I posted above, you'll note that neighborhoods with higher EV subscription in California are requiring *massive* grid reconstruction already even at their relatively low take rate.) That's the point we're making - without a new grid and new generation (which it doesn't look like the Dutchies are interested in building) such a scheme isn't going to work.
Also, since the Netherlands appear to be about to scrap their wind project due to the economic failure of the system, what renewables are you proposing they use to feed into this system? Something powered by Skittles and unicorn farts?