Same here. A crowd is any number of people filling a space I want to fly over so densly, they hardly have any room to move out of each other's way. Could be 20 or 30 people in a passageway, or 20,000 in a stadium.

I use common sense and ask myself what might happen if my drone fails and falls out the sky. So the stadium shot might be good enough from the parking lot. Why risk the stands?