Even if it were, drone builders do not want to be associated with rule-breaking drones. They are fine with falcons removing drones around, let's say... an airport. And so am I. so no reason to employ such anti-measures.
But from the get-go, the antidrone falcons are such an idiotic idea I can't even begin to take is seriously. The falcon would be killed by the drone. I say that as someone who injured himself with a drone (an average one, even) so I know firsthand how serious the damage can be. It barely can find a place to catch the drone with the models the used in the demo video. If someone flied an octocopter, the only place it can hook onto it is right from below, on the landing gear, and I find that unlikely. This would kill the bird for sure.
I find the very existence of anti-drone tech ridiculous. The who hysteria around this is right out of the middle ages witch-hunt.
As anyone who has ever armed a fighting kite with razor blades can tell you. Sharpening drone blades might even cause an aerodynamic improvement.
Drones set to hunt drones are a no brainer. The military will certainly have them so it won't be long before the police do. Even a ground based solution might work against any non hardened drone - just fry its electronics. You can pretty much limit the range of such an effect and I can imagine scenarios where all drones are just dropped from the sky.