Great weight limit
According to the BBC "Some drones, usually cheaper models, weigh less than 250g. But most - especially those with built-in cameras - weigh more."
So if you don't want all the hassle of having to pass a test/get a licence/whatever, you'll go for a drone without a camera. And if you're stupid enough to fly it outside of line-of-sight, or if it accidentally goes out of sight (say because of a strong gust of wind) you don't even have the view from a camera to give you a clue what's going on.
I feel safer already.