It's also a common annoyance in grocery store apps. Kroger, for example, has an app that allows you to scan items to add them to a virtual cart as you shop and

It's also a common annoyance in grocery store apps. Kroger, for example, has an app that allows you to scan items to add them to a virtual cart as you shop and avoid scanning them at the register... however the same app is used to read QR codes on in-store coupons, which are "helpfully" placed very close to the price tags with UPC barcodes on them. If I want to scan one of those coupon QR codes, I need to either start with the camera very close to the QR code or cover the barcode with my finger.