They are using those mostly to take down larger reconnaissance drones. Not the small ones used to directly attack individual soldiers. Watch the videos.
I never said it works against all drones. It is a valid option that has shown efficacy. In the context of this thread (one's home/property), it seems reasonably applicable, and in many locations, more likely to be legal than many alternatives.
Wrong. Shotguns haven't shown any real efficacy when used by soldiers (or homeowners) on the ground. In the USA it is a federal crime to shoot at aircraft, including drones.