Why Aren't More People Using The Walmart App?

I am not an environmentalist, but I pick up littered receipts when I am walking into Walmart. I pick up pennies too, but receipts are far more valuable. Have you ever noticed the QR code, the square thing you can scan with a smart phone, at the bottom of the receipts? Walmart has a savings catcher in their app that allows you to scan that part of the receipt and it searches nearby stores and will price-match different items you bought, and will credit you some money if other stores are selling the same item for cheaper. Since this takes some effort, many people don't scan their receipts, so I do it for them. I look like I'm helping the environment, but I'm helping myself to the money that these people could have been getting back, had they put the effort in. Odds are you're not as crazy as I am. Most people don't pick up pennies, let alone soggy receipts. I'm weird, I get it. I do know people that look through Walmar...