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Even when something is fairly inexpensive and readily available, the nature of the thing may preclude it from being well-noticed in public, even if it's not being intentionally obscured at all. Things that move are an especially good example, because most people don't really pay significant attention to passing traffic or stuff moving approximately 3-5x faster than their own walking pace, with the exceptions of when they themselves are in motion too (eg seeing another train while riding a train), or if the object is coming straight at them.
An example suited for fellow Americans: seeing the same color and model of your car, parked in public, is very easy to spot, because that's how you're accustomed to seeing your own car: stationary. Whereas seeing your own car in motion (while you're stationary) is slightly harder because: 1) it's whizzing by for only a few seconds, and 2) you're not used to seeing your own car drive away from you. Confirmation bias then means that you rarely see that same model of car in motion.
Drones have the same perceptional bias, but compounded by the fact that humans aren't in the habit of scanning the skies overhead for drones. And even if they do, identifying a hovering drone means to spot a small dot that's hanging dozens of meters in the air, or being within earshot (inverse-square law limits this distance). And if the drone is moving, then spotting it is even more difficult, although it does have a moving audible footprint now.
Finally, there's the operator, which in almost all circumstances is stationary. Yet, for similar reasons, why should anyone notice if someone is standing in a forest, looking at a screen with a set of controls? If nobody is around, is a drone operator even there? As a fairly solitary activity, it's no surprise that few have ever seen a drone actually being operated, much the same that loads of people know of Pokemon cards and yet few have actually seen the TCG played out on a tabletop (this fediverse audience excepted).
TL;DR: the general public only perceives things that are easily perceivable. When did you last see your car moving?