The really great thing to see about one of these is to see the net go into it's own propellers. As long as you're operating legally to use something like that against your drone would be considered illegal. Much the same as someone trying to shoot your drone down.
I think this is a silly concept at the moment. You have to be able to create a drone that has serious range and flight sustainment for this to ever be a viable solution. It would be much easier to find the guy flying the drone that will most likely be within a 3 mile radius. All you have to do is find the nearest clearing and they will most likely be there.