There are basically three levels of quad(and hexa, etc)copter devices (loosely):
1) Toy Grade: These generally cost $100 USD or less. Most have a range of 100m or less. And most will fall from the sky when they loose radio contact with the controller. If they have cameras, tend to be 720p or lower resolution. Virtually all have brushed motors. They tend to be small and light, and cause little damage if they collide with something like a window. Are used for the simple enjoyment of flying by the pilots.
2) Hobby Grade: Usually between ~$100 to $1,000 USD. Have a range of upward to 500-1000 meters, and usually have more smarts, including things like GPS positioning, telemetry, return to launch point, automatic takeoff and landing, altitude hold, etc. use FPV and/or high resolution (1080p to 2K) cameras. Majority have brushless motors. May be built up from parts and support many different motors, ESCs batteries, flight controllers, video transmitters usually in the 5.8G band, and tend to favour diversity and "cloverleaf" style antennae for control and video over simple dipole ones. If they can carry a payload, it is usually on the order of a GoPro action camera. They tend to be fast, and moderately heavy, and will certainly shatter or break a window in a collision. Tend to be used for things like amateur videography, racing, stunt flying, etc.
3) Professional Grade: From around $1000 USD and up to the tens of thousands of dollars. Range is in kilometers for both control and live video feed, and thus may require a radio operator license. Some are totally autonomous, while many have semi-autonomous such that they can follow a pre-defined flight path, or perform complex actions based upon different events. Tend to be fairly heavy and use brushless motors. Many can carry significant payloads, such as professional/broadcast quality cameras. Are used for professional videography, aerial surveying, Search & Rescue, Law Enforcement, etc.
Remember, this is a broad overview of classification for quadcopters, and of my own humble opinion. I am sure you can poke all sorts of specific holes in it, but would agree that it a good rough guide.
So with these classifications in mind, we can have a better discussion about the governance of these devices, and not confuse or conflagrate restrictions between disparate grades of devices.