The biggest faux pas one can make when licensing copyrights and trademarks is to do it very publicly, especially now with stuff like YouTube, where your audience and your fans are directly connected. You cannot just go out and start doing things that sound like you're asking for money, unless you're specifically setting up something like a Patreon, where it's specifically stated that the money you're asking for will go back into the production of the content that people came for. And I don't think the Fine Brothers really understood this.