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Can't see too much use in bad weather but for industrial spying, inter-Governmental spying and so on - if these things actually work, there will need to be new countermeasures.
While one of these might be useful in daytime..

Sending tiny drones around at night or in dimly lit spaces will make it so much harder to counter these things.

Mosquito-sized drone is designed for Chinese spy missions — military robotics lab reveals incredibly tiny bionic flying robots
Science fiction becomes reality.