Ask HN: Could QRCodes be Abused/Hacked Like This?

First, I know nothing of QRCodes except how to use them for price comparison so this may be a dumb question to those of you who are up-to-speed.

Basically what would stop someone from getting QRCodes assigned to a url, 301'ing that url through an affiliate link, printing their QRCodes and slapping the stickers on price tags in major chain stores like BestBuy?

I'm not going to do this. I'm just curious if this is a vulnerability in them???