If a creator is using a copyrighted content on the video, the copyright owner has an option to run ads on it. Here's more info on how Content ID works: https://goo.gl/mmqN8f . Hope this helps clarify.
@YouTube @TeamYouTube this 'youtuber' has 31 subscribers and claiming ads I thought you needed 1000 ??pic.twitter.com/a1ErwTJD2j
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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