The easy answer is to follow the same rule that you have for every other certificated aircraft and operator: Never fly under a structure. When humans do stupid

The easy answer is to follow the same rule that you have for every other certificated aircraft and operator: Never fly under a structure. When humans do stupid shit like this, we take away their license. I don't think they will take away their license, but AMZN should have to explain exactly how their drones managed to crash by flying themselves under an obstruction twice in a row.