I think you misunderstand - prisoners and people that are "diverted" from prison to rehab are being sent to chicken processing plants as part of their sentences. The taxpayer is paying the bills to these institutions and then Tyson is getting labor for free.
ahh, the most under talked about part of modern slavery. "But they got arrested for a good reason, so of course they need to do labor to repay society". Yup, exactly the kind of narrative a private prison incentivized to detain people wants to spread.
Shame it will take a much more radical change to how people view prisons to truly break this mentality.