Facebook has published stricter standards & guidelines for what can be monetized

https://techcrunch.com/2017/09/13/facebook-monetization-2/

Facebook wants content creators to earn money, but not at the expense of the family friendly social network it’s built, or the integrity of its advertising clients. So today Facebook established formal rules for what kinds of content can’t be monetized with Branded Content, Instant Articles, and mid-roll video Ad Breaks. These include depictions of death or incendiary social issues even as part of news or an awareness campaign.  This is a big deal because it could shape the styles of content created for Facebook Watch, the new original programming hub its launched where publishers earn 55% of ad revenue.