Drone technology, apart from numerous peaceful use cases has become a force multiplier for offensive operations. Drones capable of inflicting damage on infrastructure, lives are not only limited to nations with large defence budget, but has been effectively used by unorganised groups to cause large scale damages due to the low cost of developing and operating a drone force.
Malicious or accidental use of drones in airports have wreaked havoc. Drones are not limited only to air, explosive laden drone boats have already been used in the conflict.
Current counter-drone or anti-drone tech involves blocking signal to the drone for forcing it to land, hacking and use of physical force to destroy drones. The rise of auto pilot, anti-jamming/hacking, swarm tech would render existing counter-drone measures obsolete and hence the need gap for efficient area denial counter-drone technology.