I think it was RadioLab who did an episode on the content moderators for Facebook. To make matters worse, much of that work is outsourced to developing countries who get paid pennies and have no mental health resources available for ingesting so much traumatic content for 10+ hours a shift every day. It's been a few years since I listened to the episode, but I think the turnover was extremely high due to the understandable burnout. The episode also touched on law enforcement workers that have to review that content for legal cases and the mental toll it takes on them.

Hopefully, one day, people won't be needed for that kind of work as automation improves to the point that it has a 100% success rate in detection and removing. And of course, hopefully one day there are no longer humans creating/producing such disgusting content in the first place.