You are of course spot on. You have to asses the cost of implementing vs the risk/cost of the attack For a spurious one time threat from an unknown actor, then

You are of course spot on. You have to asses the cost of implementing vs the risk/cost of the attack For a spurious one time threat from an unknown actor, then most of these are overkill. However against a known adversary with an MO for doing drone attacks, these might be legitimate. An example, a sports event: stringing a fine net from the building/all weather lights, directional GPS blocking (its RF so can trivially be localised.) is cheap and proportional. "RF snipers" with 900 watt converted microwave "guns" (or more likely a beam forming radar type affair)