The EU / Spanish polices also got apparently much better at intercepting cannabis dealers trying to pass from Morocco to Spain (hence maybe these new drones attempts).
So now there are both individuals and gangs (including gagns from Morocco and from eastern europe) growing a huge lot of weed in Spain. As in: it's becoming very big business.
Individuals have the right, legally, to grow up to two cannabis plants (I think two plants for one adult in the household is the rule and you can legally by flowering and auto-flowering cannabis seeds in shops). But quite some individuals are, illegally, growing much more than two plants as a way to meet months' ends.
Technically this delivery drone is impressive but dealers from Morocco have much bigger problems than trying to stuff ganja into drones without getting intercepted: growing cannabis plant and making hashish and ganja directly in Spain, at cheaper prices.