Basically the Fine Bros have branded themselves to be the leading "reaction video" youtubers. They get a lot of views and have a lot of subs, but apparently it's gone to their heads. They're going to try and copyright all "reaction videos", which is complete and utter bullavocado, considering that what that is, is a video that's literally just showcasing a person reacting to something, and is by no means something unique that the Fine Bros have come up with on their own that should entitle them to copyright.