There's one such site that creates a QR code representing a cryptocurrency address. Once it's created it will display your code with right next to it their own

There's one such site that creates a QR code representing a cryptocurrency address. Once it's created it will display your code with right next to it their own wallet address for "donations", labelled in tiny font. Can't imagine how many people scanned the wrong one, even just pointing your phone at the screen can capture the wrong one. Pretty "genius" idea.