> movie and video game industries control their own content ratings
Not sure you're helping yourself here. The established movie industry uses its content rating system as a bludgeon against independent filmmakers. The video game industry's content controls are largely a joke, assigned arbitrarily by people who never actually play the game.
Short version: Most cinemas and other outlets in the US won't carry your movie if it's unrated, so in effect those who control the ratings control which movies can get distributed. Also most cinemas in the US won't show NC17 rated movies so the ratings people can also use that as a way to prevent your movie being shown to a large cinema audience if they want to.
Not sure you're helping yourself here. The established movie industry uses its content rating system as a bludgeon against independent filmmakers. The video game industry's content controls are largely a joke, assigned arbitrarily by people who never actually play the game.