The way YouTube works, from the way I understand it, is that anybody (in this case the Fine Bros) can claim to own something and flag any video for infringing it. YouTube then automatically takes down that video and it will remain the status quo unless the video uploader files a dispute for YouTube to analyze and be judged in the uploader's favor, which YouTube almost never even look at let alone judge. Potentially any jackass who owes nothing can file a takedown on YouTube to take down anything because YouTube basically just bends over backwards for whoever files any takedown request, so realistically the Fine Bros don't even need to have it actually trademarked to screw over all of the smaller channels. They can just claim they have it trademarked, which has been the case for all their past takedown attempts.