Mr Bronk says that utilitarianism (the idea that society should aim to achieve the greatest good of the greatest number) supplied Smith (who explained the market system) with moralcontent.
Then, I think the other thing that comes along with that is that if a parent does come across a game that they feel has gone too far, that they feel has content that they object to, that that makes it something of a moral objection.
Once YouTube has made the decision to pro-actively censor its content, they start down a slippery slope that ends in YouTube Knows Best moral policing of every video on their site.