If they want to get serious about protecting No Fly Zones for drones the Chinese might be on a more effective path. Lasers! Just scale it down to the right size and use less power for the very vulnerable small drones. Besides cost, I guess it has the downside of disabled drones falling out the sky, however, I think the French net technique will likely also result in both drones fall out the sky - if they can actually catch a rogue drone
From a news article last fall:
China unveils laser drone defence system | World news | The Guardian
has developed a highly accurate laser weapon system that can shoot down light drones at low altitude, state media reported.
The machine has a 1.2-mile range and can bring down “various small aircraft” within five seconds of locating its target, the official Xinhua news agency said, citing a statement by the China Academy of Engineering Physics (CAEP), one of the developers.
Xinhua showed pictures of large metal boxes in camouflage paint and the wreckage of a small drone, some of it burning.
The laser system is expected to “play a key role in ensuring security during major events in urban areas” and address concerns on unlicensed mapping activities, according to Xinhua. It is effective up to a maximum altitude of 500 metres and against aircraft flying at up to 50 metres per second (112mph), Xinhua said."