Imagine spending dozens of hours on a youtube video that's 28 minutes long and you use less than 2 seconds of a copyrighted song https://www.youtube.com/watch?v=KEPCEZpnbJc&t=343 … and now they get all money from the video, wish the copyright system had owners take a proportional amount, not everything 
Or maybe rather than take any profit YouTube would actually look at disputes for themselves to see if it is fair or not just an idea @TeamYouTube