I think they have to do this. And, I doubt that it has very much to do with offencive content. It's probably really about IP theft.
If Valve claims that they are controlling what content can and cannot go up in their Marketplace, then IP Theft games make it through, they have likely opened themselves up to some liability in that regard. Or, at least, one could argue that way in court. But, if they claim that they are not moderating the content, then they have at least some grounds to argue in that same court that they simply operate a Marketplace, and are not responsible for what people sell there.








