Maybe the license is needed only if you want to collect the bounty. I can see were there might be so many potential licensees that they'd have to have a lottery to see who gets them.
I'd rather do it for free. A license is just a tracking device...but I must be guaranteed that I can't be arrested and prosecuted for being a drone-ist.
If busted, you can always claim that you were shooting at a UFO, or a darn big mosquito.
Self defense...slam dunk!
This could become the next new Olympic event.