Dashcam car accidents on You Tube?

I hadn't seen anything about legal requirements.
Do you remember the Chelyabinsk meteor in 2013? They say it was so well documented because many Russian drivers use dash cams to avoid insurance fraud. Apparently the pedestrians would throw themselves into a car for a settlement. Interestingly, brake checking there was also a problem and dash cams are the only way to really prove that the trailing vehicle was not at fault.