This does come up here & there on YouTube, but with good outcomes. Now I do hate to hear that a person is within their right to copy a video, cut it up little bits & comment in it with out fear. Too many people that is good thing, but to a few people thinks that the DMCA is not a real thing & don't care about the one in the right of way.
There are too many times that I have hear a person that is doing nothing wrong. Then hit by a copyright clam for no reason that seems mean to do. Has to disputed it with some jerk that thinks there above the law. Then hopes that the video will not be taken down & maybe lucky to be free of any wrong doing in the end.
I really hopeful that I can be lucky to never have to do throw any crap that I have heard that many people on YouTube have gone throw in the past few years. The horrible stories that I have heard really shows the dark side of the human ego is not that good.