Real answer? producers orders, they have list of "what to do and what no", "artists" receive orders and if they dont follow them they are just kicked and forced to work, actually in my shithole we had a problem because a lot of milk producers (fonterra) forced black people migration in advertising with lies (our country is white-native with a few asians mix, no black untill 10 years ago and the ones coming arent exactly decent workers, crime, aids and animal torture is on the rise), the people stopped buying their milk and stores just removed the milk that wasnt produced by brands that didnt showed blacks with lies, they are actually loosing a lot of money, but they keep pushing that and blacks dont buy milk here and the new advertising is insulting people that dont buy that milk, fun fact, the ones that are coming cant tolerate lactose like us so it isnt a "free market" problem, its like big corporations are controlled by something bigger.