Defense News has the article US Military’s New Swarm of Mini-Drones.
With no motor and only about 10 parts, the Cicada resembles a paper airplane with a circuit board.
That may not sound like much of a drone, but you have to read the article to find out what it can really do. If you thought your idea of a conventional drone was a threat to your privacy, read what these things can do. Low price is no small part of the threat.
Perhaps you have to use your imagination to get it. If you don’t have enough imagination, you can rest assured that criminal and the military element have more than enough imagination to make up for what you and I may lack.