In America the drone registration situation is completely daft, for example: what requires registration (image)
yes, hang gliding is a self regulated sport that requires no government certification or registration. however, this works for reasons that do not apply to drone operation:
1. there is a sequential ratings system for both pilots and courses.
2. most hang gliding locations require certification from a national body (USHPA, HPAC, etc).
3. untrained or poorly trained operators don't last long enough to be a threat to others.