I don't think anyone is disagreeing with the fact that Nintendo has the right to stop people from posting videos of their games. They have every right to do so. But people are arguing that this goes against the spirit of gaming, which is about sharing your experience. A lot of times people are influenced to play a game when they see others play it. It's a shared experience. By putting any kind of barrier, whether that be monetary or whatever is hurting that shared experience. Did Notch have the right to take down all the Minecraft videos? Of course. Did they decide to take them down or claim money from Let's Players? No, and it helped the game get more exposure.
Also on another point about Youtubers wanting to earn money from their videos. This should be a given. It is their livelihood. Sure they love playing games but at the same time they need to put food on the table. In the case of PewDiePie, yes he's very big and earns a lot of money but not all Youtubers are that big and they barely make do with whatever ad money they get from Youtube and probably some sponsership deals. PewDiePie was speaking generally about all these people who aren't as big. In the end just because you love doing something doesn't mean you can necessarily do it for free, because you do have to put food on the table.
