I've heard first hand from employees how awful Goodwill treats them. Not just the disabled workers, but the regular workers as well. Many say they're very unhappy there but can't find work anywhere else. My brother worked for them for a very short time and told me corporate has very unreasonable expectations for their stores and employees and have forced certain pricing employees to read and memorize labels from magazines like GQ, Vogue and Esquire.
I'll see your brother and raise you one ex-sister-in-law (well, nearly--we were never married but lived in sin long enough). A high school dropout. Popped one kid after another, spaced just far enough apart to keep the government money coming. Finally, after being utterly and completely unemployed with no good excuse for 15 years or so, she finally got a job. Guess where? Turned her life around and, after a few years at Goodwill, she got on at Costco and is now a homeowner and paying taxes. Nobody but nobody would have given her a chance, but Goodwill did and she made the most of it.
Again, this may be chapter specific. I don't know about the place your brother worked. I can only speak from personal experience. Sure, they make you work, and they make you work hard. I don't see anything wrong with that.