Yeah, I saw that and just thought hell no. I'm partially sighted & there's no a chance I'd let someone guide me across a road via video chat on a 3G connection. I'd go as far as saying that's quite an irresponsible use to suggest on your home page.
It wouldn't be any different than the passenger in your car telling you, like "clear right". Any resulting accident is still the driver's fault afaik.
there isn't network delay when your passenger tells you its "clear right"
Yes; also, if the person is in the car, they're risking their own life -- not so if they're hundreds of miles away.
Not to mention the vastly better field of view and detail. Neither of which translate very well through a phone camera.
I think it's much different from a legal standpoint. First and foremost, the driver is assumed to be fully valid and thus in no need of a blind trust (no pun intended).
I have heard that if you were to, say, wave someone through at a stop sign and they got in an accident you could be held liable.