No doubt, drones can be totally helpful. From aesthetics to military use, it can serve its purpose. Unfortunately, some people use it to invade privacy, which becomes scary. How can something that is meant to be helpful become the root of illegality?
The sad thing is that even if its purpose is always to do good, once it has been given to the wrong pair of hands, then it can be uncontrollable. That is one of the reasons why drone jammers are invented to stop spying on you, your car, or anything personal to you without your consent. Whoever these people who attempt unauthorized tracking on you should be stopped, and this is the right device to do so.