Here, have some facts.

https://en.wikipedia.org/wiki/Penal_labor_in_the_United_Stat...

Arkansas, Georgia, and Texas did not pay inmates for any work whether inside the prison (such as custodial work and food services) or in state-owned businesses. Additionally, Alabama, Florida, Mississippi, Oklahoma, and South Carolina allowed unpaid labor for at least some jobs.

It’d be inaccurate to say that no one is paid for their labor, but it’s dishonest to claim that all prisoners receive wages, especially when it’s not always the case, it’s an order of magnitude below the federal minimum, and they are forced to pay above-market prices for necessary goods, as others have pointed out.

You can also review Council v. Ivey about parole denial to continue forced labor through one of those fancy terminals.