I'd just like to point out that in many cases it isn't the publishers but Google to blame for this. Take Angry Joe's situation, for instance. Both his good and bad reviews were taken down because of the Youtube system for auto flagging copyrighted materials. Hell, some of his videos went down because of trailer footage (public domain by definition, I would have thought), and some of them went down because he used music that he's purchased from a company who specialise in music for Youtube videos - they'd added their music to the autoflagging system not because they wanted to stop people using their music, but because other people were putting up false copyright claims on their music on Youtube videos. They had to screw over their customers temporarily to protect those same customers from being screwed over more permanently by random assholes on the internet.
My point? Youtube's copyright protection policies are at fault here more than anything else. Sure, Nintendo and Sega have been jackasses lately (there's a reason why Total Biscuit won't do any videos regarding Sega games), but the lion's share of blame belongs to Google for their shit DMCA system. Hell, I can bring a video down that I don't like by claiming copyright, even if I don't actually have any right to it. They can dispute it, but if I dispute their dispute, they have to actually go to court, and most Youtubers won't bother.
My point? Youtube's copyright protection policies are at fault here more than anything else. Sure, Nintendo and Sega have been jackasses lately (there's a reason why Total Biscuit won't do any videos regarding Sega games), but the lion's share of blame belongs to Google for their shit DMCA system. Hell, I can bring a video down that I don't like by claiming copyright, even if I don't actually have any right to it. They can dispute it, but if I dispute their dispute, they have to actually go to court, and most Youtubers won't bother.