I was thinking that, but then realized that the concept of fraud doesn't really apply in the way we're used to. I mean you're allowed to walk into the store, take anything you want, and then walk out.

How would you even define fraud in that context? Presumably there are things you could do to confuse or mislead the technology, but it seems to me that as presented the onus is on Amazon to just charge you the correct amount based on what you leave the store with.