Reasonable height/Goldilocks zone
Too low and the blades might take your eye out and/or the noise is irritating.
Too high and you worry about a failure causing it to fly like a brick onto your head.
Is there a sweet spot in the middle? Or could you persuade a court that "too low" and "too high" overlap?
I wonder if lawyers are funding drone development. They'll be able to spend many a happy hour coining it in court over this.