If you're not a wage specialist and my guess is as good as yours, why were you so quick to dismiss someone who actually lives in the country you're opining on?
It's clear you're one who enjoys a circular argument so I'll just leave it at this for you. I don't need to know the exact right amount of money these people should be paid to know that $1.32 per hour for looking at child porn and violent imagery is too little, especially without the requisite mental health resources available. If you are so sure this is a fair situation, maybe for your next job you'll accept minimum wage pay doing similar work.
It isn't pictures, it is text only. I think there is a huge difference. I had to police content for Twicsy (a search engine with 10 billion Twitter images indexed) and I have seen some very bad stuff. There is a huge difference.
This is just false, if you read the article Sama also collected explicit, illegal images on behalf of OpenAI -- this was the reason the contract was cancelled.