Some uploaders do get revenue from it though. I've made a post about it a long time ago, but basically. They find a video on youtube - re-upload it to facebook with small edits, it goes viral and burns and crashes soon after. The "stealer" makes some comission while facebook makes the most, then if the original uploader notices it and reports it its already too late. No penalty for the person who stole it cause facebook has their own video player so they gain a lot from it, while the original content creator gets almost nothing and the attention to the video is lost shortly after. Has happened many times and facebook just doesn't care.