Even if they were surveilance drones they'd still be real, as opposed to mass hallucinations beamed into our visual cortexes by satellites. Of course, they're not actually surveilance drones, that's just a conspiracy theory started by the CIA to identify and monitor conspiracy 'super-spreaders' who can be used to spread whatever memetic trope the goverment of the day wants. No, really they genetically altered most plant species to act as resonant cavity bugging devices like The Great Seal. They monitor them with the same satellites they definately don't use to beam out mass hallucinations.

/s of course, because, haha, that would just be silly, and I don't want to be picked up and 'reprogrammed'.