Look, I build these things as a hobby. I am not a hysterical nay sayer. But..........
Firstly, planes and helicopters are a lot harder to fly. So there is a skill barrier that puts most people off.
Secondly, these drones are very stable. Couple that with now cheap HD corrected cameras, and any one can literally spy right in to your daughter's bed room.
And this is the real shit of life right now. Almost everything fun and cool is also threat to privacy and freedom, as much as it protects privacy and freedom.
The game has changed. Even a year ago my drones were "cool". People loved to see them and we fascinated by them. Today, they fear them, they are suspicious of them, and now my motives get questioned.