As far as I knowI YouTube manually puts videos in trending. It's your team without thinking put it in trending. I would have flagged it if it wasn't on trending.
Thanks for bringing this to our attention! You may report videos that contain spam or misleading thumbnails: https://goo.gl/n0WUMW . This will flag it for review, thanks.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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