Am sure Quads have bin used for a lot more than spying on yr neighbors daughters for some time now.
I've been playing with vid/film camera's etc in toy planes/heli's for years now & with 2day's FPV gear it's bloody scary what can be achieved nowadays.
When you think about it a Quad loaded with C4 & sent out on a kamikazi mission using GPS could be very lethal to an exact spot!.
Wmk2