The more drones we have in the air, the more drones we'll have crashing to the ground.
Although it may not be completely legal to fly a consumer drone anywhere you'd like, anyone with a credit card can purchase one without any instruction or license. And because drones are so widely available, that means there are a lot of amateur drone pilots out there.
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Additionally, some people (and nature) aren't too keen on the idea of a bunch of flying robots whipping through the sky, causing plenty of mishaps.
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