The most frustrating thing is it looks like V2G is easier and more accessible than V2H[1]: it's easier to give control of your battery to your energy provider and bypass your house to help the energy companies than it is just to power your own home with your own car battery.
Technically, this is ridiculous. You don't bypass your house when you do V2G.
My tinfoil hat is clearly making me too cynical when I say this, but I think it's this way because of the relationship between energy providers and law makers. These are the same energy providers that use "changes in wholesale pricing" to justify increasing how much they sell me electricity for, whilst reducing the amount they pay me for the solar electricity I sell them.
Some company is going to create a gray-market "high voltage -> top N home battery systems" dongle that you can just wire into the battery pack on your car. That company will make a fortune (but only if they're able to dodge liability).
I've heard of people doing similar with old prius beaters. You wire the 500V (or whatever) DC battery into an inverter, and then plug your fridge, etc into it. Leave the car ignition on, and it runs the gas engine for a few minutes an hour indefinitely because it sees the drain and thinks you are driving it.
Most modern EV's support this sort of thing officially, but they're hardwired to one brand of house battery. So, when you buy a new car, I guess they think you will throw out your house solar panels and backup battery. If you want two cars, then I guess you get a divorce?
My local establishment's energy czar is also on the board of the electric company (itself a natural monopoly of course).
No tinfoil hat required. They have re-elected her several times as well.