[atishay811]

I imagine if Facebook could use its users to moderate content from others, say you are sign up for moderation, then have to moderate 20 posts from unrelated users to get 20 days of ad free Facebook. Facebook could employ a system like re captcha uses to identify users faking it.

Win-win?

[dRaBoQ]

Facebook won't be able to install the necessary measures to prevent the moderators from saving the videos onto their own machines.

A lot of the bad content is highly desired by criminals and can even be profitable to sell on the dark web (e.g. child abuse).