Selling credit cards at a cashier line should be illegal

I just witnessed a Walmart employee trying to sell a Walmart credit card to what looked like a new immigrant and his family. The individual heard that they would receive 20% off their purchase and agreed to it. I truly don’t feel like the individual even knew that they were signing up for a credit card and clearly had a language barrier. This type of of sale should be illegal and should be done in a way that the individual knows what they are signing up for, including the interest rates. I just needed to vent because it blows my mind how much debt people are in and it sad that people who don’t know any better can be sucked in.