He was at a pretty significant altitude with zero dwell time at any point. It's legal in the U.S. to fly over traffic as I understand it. There weren't any crowds he flew over, and if you look closely, the four people he launched from included his significant other and the guy with the drone- you can see his controller and all seemed pretty cool about it. He wasn't over them, it looked like a dronie shot, ie., moving up and away. The other couple earlier in the shot, was again, the drone guy and his girl.
Honest question: what was illegal or uncool about this vid?