BTW, you could do some simple math to figure out how many employees it'd take to have a human watch every video that comes in. 3600 secs/hour * 20 hours of video/sec = 72000 secs/video/sec, * 3 to assume 8 hour shifts = 216,000 employees, * $30K/year = $6.4B/year. It's theoretically doable, but you wouldn't get the product for free anymore.
$2B is still nothing to sneeze at, but it's less than Microsoft paid for Minecraft.
YouTube could probably outsource it internationally, but that'd just spark a new round of outrage: "Why are global community standards set by an American technology company outsourced to poor workers in the Philippines? Are these the people we want deciding our values?"