If I were the commander of a military base on us soil or some other sensitive outdoor property, this problem would likely keep me up at night.
From my research, it’s a pretty difficult problem to solve. It’s not like you can just safely use rifles fired into the sky.
An easy low tech approach for smaller spaces is the installation of bird netting.
Most techniques for detecting and stopping a drone are only useful for one type or manufacturer of drones and it’s pretty tricky.
The aerospace companies have developed sophisticated high energy devices like lasers or focused microwave beams that can detect and destroy drones, but detection of a drone can be tricky, letting it fall from the sky can be dangerous, and the high energy tools can have unwanted effects.
Jamming gps is another option, but only the feds can legally use this tech and it won’t necessarily stop a drone that is being actively piloted, it just forces it into Atti mode in many cases.
Large birds of prey are not super practical.
Drones with nets are an interesting concept but they suffer from the same detection problems as other technology. It’s difficult to make this work with ALL drones. Plus, a large drone mike a matrice 600 would likely exceed the carrying capacity of a drone hunter.
There are ground based nets that are fired from handheld devices as well as cool miniature “missiles” that are fired from an automated platform.
So far it hasn’t been a problem, but if bad actors wanted to utilize drones for evil it seems like a difficult problem to combat.