Re: Conspiracy theory
The difference is in the props.
A helicopter has variable-pitch blades on the rotors, while a multicopter has fixed-pitch blades.
This means that tri/quad/hexa/etc/copters are much simpler to build and repair as there are far fewer moving parts.
- A quadcopter has exactly four moving parts and eight bearings/bushings.
That said, this almost certainly was not a drone anyway. It will have been a balloon or a plastic bag. Model aircraft do not fly fast, and are relatively rare. Balloons and plastic bags do not fly fast, and are very common.
In both cases you'd get to see it for a second or less, only enough time for a "flash of colour".