I suppose I should have explained it a bit instead of just linking it.
Anyways, Nintendo is preventing anyone from earning money off of Let's Plays of Nintendo Games. If you upload a Let's Play of a Nintendo game, YouTube swoops in and steals any revenue you could earn off of it (Or adds commercials even if you weren't going to earn money off of it).
Don't expect the Let's Play community to be too happy with Nintendo unless they withdraw from their new position. Also, don't expect people to buy Nintendo games as a result of Let's Plays, since most people will stop making them, and many YouTube personalities have announced that they won't be touching them, one going so far as to not even upload a video he'd already finished editing of Lego City Undercover.
For added vitriol, Microsoft also does this. Yes, Nintendo is taking cues from Microsoft.
A small thing? Yes, but in the grand scheme of things, if Nintendo doesn't do a fast heel turn (And they won't do that any time soon), this is only going to bring them down sooner. Being successful in the game industry is all about being talked about, and Nintendo just effectively shut down one avenue of communication, and probably one of the most profitable (For them - It doesn't cost them a dime, unlike traditional advertising).
If Nintendo can be so ignorant as to how this Internet thing works, what other mistakes are they going to make?