So why did they choose to use permissive license instead of the license of the original?

There are a lot of different drones being used. For example you can’t use fiber-optic for drones that target something 100km afar. Either way the problem with this device is probably the same as with other anti-air systems - it costs, takes time to produce and to train the operator much much much more than to make a drone.

Don’t just speak for everyone.

Pretty sure that shortage would be indefinite. Same for consumer GPUs. Maybe some other tech shortages will appear.