As you probably already know. A drone pilot used the "return home" feature of his drone and the pilot is liable for damages it caused when it collided with a helicopter in an area with a temporary flight restriction.
Later in the pub he told someone who worked at BAE, and was fairly high up, and the guy said, "yes, I heard about that, you need to contact them."
He did, and he got the full "men in black" treatment with several interviews/interrogations to determine exactly who he was and what his intentions were, and threatened with jail time. Eventually they believed his story and he even got his drone back, although the camera was obviously missing.
Apparently it had landed next to something "extremely sensitive", which may or may not have been the cause of it drifting off in the first place.
It may fail in practice, but the claim is all that should matter in court.
Yet, I'm sure somebody somewhere is going to be thrown into the lions for protecting some rich company. So I'm certainly not going to be one of the first to buy one.
I don't think so (never heard of) but I might be wrong.
I can imagine that they would be very complex to create.