You are right! It has to be installed in hidden places etc. Unfortunately, I had a big motorcycle accident and forgot to install my GoPro. If I would have a footage of the accident, I could prove that it wasn't my fault.
Yeah I've been in the same situation following an accident, if I'd had a camera I could of proved I was not at fault but footage prior to the accident would at the very least have been frowned upon!
Mines just for track, I've used it in the road and always find the footage a bit boring when I watch it back.