Before I started reading that article, I was slightly in support of prison labor. Everything I read about incarceration is that it's incredibly expensive.
I thought it would understandable to help offset the costs, not actually make money. I didn't see anything in the article that put over all costs and profits into context. I can't imagine those systems are actually generating more money than the total costs of incarceration, but I have no idea.
Then I got to the parts about safety, inappropriate/illegal? coercion, and abuse. I know there's some worse places to be in prison in the world, but still.
We used to make people do stupid shit like break rocks just for punishment, but I don't see how that rehabilitates. Learning job skills is good, nice to hear a few people were bettered and got jobs, but legislators in those states probably need to be harassed until we get prisoners treated in appropriate ways.