Warner Brothers' music arm Warner Chappell recently went after mid-tier YouTuber Mumbo Jumbo, best known for his complicated minecraft creations. They claim that a series of chords within the song he was using for his intro (for which he did have a commercial license) are not accounted for in that license. Bear in mind, they're not interested in selling him a license for said chords (as that's ludicrous) but they will happily take all of his ad revenue from his channel- literally stealing his money from his long-form videos based on a maximum of 4 seconds of audio.