It's not just that. There are people that will outright deny that it's happening. The reasoning trotted out is that if it were true that this were happening then it would be squashed. In other words, if it were happening, then it would not be happening. From the article:
> According to a 2018 report by Good Jobs, between January 2000 to 2018, Walmart paid over $1.4bn in fines and settlements over wage theft violations, FedEx paid over $500m during the same period, and Bank of America paid over $380m.
Sans data about Walmart's $1.4bn in fines, they'll reason to themselves that Walmart, even if it's not somewhere they personally would ever shop, is a reputable company, therefore this isn't something that happens at Walmart.
I have experience firsthand (from a low spot in my life) that FedEx continues to do the same thing, especially to people who are powerless to do anything about it. To wit:
Their warehouse workers get paid low wages and the arrangement is that you need to be available between 4:00 AM and ~10:30. It's not that you'll be working during those hours. No, instead what happens is the night before they determine how high of a load they have and then set the hours for that time. So you as a worker call in at around 9:00 PM the night before, listen to a recorded message that states e.g. "On Tuesday, February 13, package sorters will begin work at 5:30". So far not so good, but there's nothing especially illegal about this is as far as I know. (It stretches morality and ethics, however.) What is illegal as I understand it is incidents where they tell you to report to work at that time, people show up, and then find that the timeclocks are papered over with a sign saying not to clock in because there was an issue at the warehouse overnight and the systems aren't running, so they've moved the clock-in time ahead 45 minutes to when they expect the systems to be up and running. You are expected to wait there off the clock despite not being paid and being expected not to leave.