These are all irrelevant gotchas but also not particularly insightful.
>Prison guards should work for free?
No, but their employment shouldn't be tied to how many prisoners there are.
>How about maintenance workers?
Ditto
>How about contractors who build the prisons?
Hopefully there aren't building companies that would lose out significantly if prisons stopped existing to the point that they'd be incentivized to get more people in prison.
>Are they all incentivized to keep people in prisons?
I'd hope not, but maybe they are, and if so that's awful.
>What if a government-run prison outsourced management of prison to an outside company - is that OK?
It would depend on how it's set up, but I think such things do exist and they're usually not much better than private prisons.
What's the point of all of these irrelevant questions? Their answers don't affect what we should do about companies profiting off of prison labor, at all. They're irrelevant.
>I understand your sentiment, but I think private prisons is one of those non-issues that are blown way out of proportion (like the idea that somehow prisons are full of non-violent drug offenders). Nothing changes if you get rid of private prisons. I suspect you know that because your primary objection is philosophical rather than practical. You just don't like the 'idea' of them.
This point would be better made if you had any sources to back this up, at all. Like, I could theoretically try to rebut these points with sources, but then I'd have effectively gotten gish galloped.
>Vilifying profit as this great evil is a common trope among the internet intelligentsia.
Why are you so quick to defend profit? It's pretty clear to me that allowing companies to profit off of prisoners is a perverse incentive, and the only refutation of that fact you can give is a bunch of irrelevant points, unsourced waxing lyrical about private prisons, and then blandly pointing to "oh you always hate profit". Do you own a prison? Why are you so invested in defending them?