They are sold as devkits any you need to install software on them on your own. And, IIRC, their software is meant to be used as drive-assist and doesn't work if user does not look at the road.
> How legal would that be if it crashed my car or ran someone over?
Generally it is not legal for you to crash your car into others private property (or public for that matter) or run someone over. Just because you have some electronics connected to your car that you installed yourself, doesn't shift over the liability to someone else.
Not sure why your mind is blown here. People are allowed to modify their cars, but not hurt other people in the process.
How legal would that be if it crashed my car or ran someone over?
My mind is blown here. Obviously it only works with specific cars that can turn the wheel for you so my 2015 ford focus is impossible but I mean wtf.