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Additionally, most sanctioning bodies make a deal with a camera company to be the “Official Camera of the blah blah blah.” The sanctioning body is getting paid and wants to be sure that no other brands get any coverage. This came to head when Chad Reed signed a deal with a competing camera company (Fly 360) and was told that he couldn’t film with it and couldn’t even wear a dummy camera on top of his helmet.
The second part of the rule is about mounting the camera per the manufacturer’s recommendation. This is logical, but in face of the F1 Champion Michael Schumacher’s skiing injury, where it was alluded to that the camera on his helmet might have contributed his brain injuries, there have been safety critics who want helmet-mounted cameras banned. Of course, this will never happen as long as camera companies pay the sanctioning body.
The third part of the rule bans playing music inside your helmet during qualifying, practice or the race. This is a safety regulation to make sure that the racers are aware of what’s going on around them — especially the position of bike behind or next to them, which can sometimes be discernrf by hearing them.