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I understand the desire to protect ones' IP, but yes, I do think the company is being short sighted here, and the revenue they may receive is more than offset by the negative publicity this is generating, and they could potentially lose the promotional effect of the best of the Let's Play videos. Other companies have done the same thing though - I think Capcom may have as well, although I'm not 100% certain. There are game sites that even have reviews of Let's Play videos, so I'm pretty sure that lot's of enthusiasts will notice and think this is a jerk move by Nintendo.