This is one of those studies where you naturally assume that someone just pulled this number out of their ass...until you see the math. 
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This brings the final cost of screening all video uploaded to YouTube at its current rate to $36,829,468,840 per year. Yes, that’s nearly $37 billion per year. That is a massive additional cost to expect from Google to cover a thorough analysis of all video being uploaded. And this excludes the immense backlog of video YouTube already hosts. This would require 199,584 judges to be hired as screeners.