Fight the drones with drones.
How do you foul their propellers?
It can be done on an individual basis. There is even a net deploying drone. But you’d have to have someone in visual range as you have to guide one drone onto another drone and deploy the net. While I suppose it’s possible, you’d have to have dozens of people spotted just about everywhere and they’d have to see the incoming drone. It might be at 10,000 feet. I think they generally fly high for direct line radio control. They’re getting sophisticated and using RF all over the spectrum, not just the channels “legally” allowed. So, jamming them is difficult and spotty at best.
Perhaps the net deploying drone could be automated, radar guided, and computer controlled. But they are short range so someone much closer would need to launch the drone. The logistics of that is problematic. “Hey, we’ve got an alert. Where’s the drone handler?” “In the can.”
You probably won’t know if the target has a tiny jet engine or a shrouded propeller. Not all interceptors can intercept all potential targets. You’d probably be looking at no better than fifty percent. At which point you have to look at the cost of this approach vs results potentially achieved. (I suspect even automated the interception rate would be low because the launch point and targets are so close together.) You have to look at all the probabilities along the entire kill chain.
Whatever you do, it will be countered and become less effective much sooner than the missile approach.
How do you foul their propellers?
That would be a net gain, so to speak...