But 99.9% of all videos uploaded never gets more than a few handfuls of views so those are irrelevant. Of the remaining 0.1%, you don't need to watch every second of every frame - speeding it through at twice the speed should be doable. So by your own calculations, 72 000 * 0.001 * 0.5 = 36 people working full time.
>>bjourn+(OP)
You can set that 0.001 factor as big or as low as you like, but then we’d get the same nytimes hit piece saying this is intentionally being done by humans.