It sounds like the ESRB could make it harder for indie game developers to sell their games. Recently, the Entertainment Software Ratings Board announced that it will be eliminating free, short-form ratings for digital games according to Gamasutra. While there aren't any laws mandating a rating, if a game isn't rated by the ESRB (or PEGI internationally) good luck purchasing it at a brick and mortar store, or on a console's digital marketplace.
Via: Variety
Source: Gamasutra
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