This is an argument that the job shouldn't exist at all. That's an okay argument to make (I personally lean that way), but has no relevance to whether $2/hour would be worth it to a Kenyan.
I think people can make that choice as long as it's informed. The company should also be providing mental health support as part of the job. Someone has to do it. There aren't automated systems that can do a remotely decent job at moderation yet. I know you don't think it's okay for trained systems or social networks to distribute traumatizing material.
