Pay is directly decided by supply & demand. Indirectly, that causes some riskier jobs to be more highly paid (no supply of people willing to take the risk). But in general, risk is not a direct factor in pay.
People's payment is never related to the mental or physical effects. A friend of mine pointed it out that it is about how replaceable a person is.
I guess you mean in USA, right? Because my experience in Germany and Spain was different.
Yes. I can only talk about what I know, so can you explain how you think Germany and Spain are different?
Are people there getting paid based on the risk they take instead of how replaceable they are?
Which is why Facebook's hourly rate for their moderators is $1-15.
I guess what would happen if this person becomes permanently burnout or suicides because of this long exposure; my understanding is that the employer is responsible for that unless the contract has some compensation and mitigation for the effects on the worker's health...