He may have cut off comments because WLD appeared. It came up in discussion elsewhere that many people who stick stuff on Youtube or who write tabs or collect lyrics are so uneducated regarding the way copywrite laws may affect them that they easily spook when they think someone may be about to invoke such laws. They may be doing nothing wrong, or even when they are, the resolution could be easy (such as here, where just acknowledging WLD would likely be courteous and enough), but they're nervous and prefer to ignore the problem or run away from it.