> Is it really spying if you are entering the store with full knowledge that your every move is being watched by a system in order to automatically track your selections?

True, I was being a touch aggressive in calling it "spying". However, if this sort of thing becomes so ubiquitous that its impossible to avoid, then it is 100% spying even if fully disclosed.

The difference between data collection being "spying" or not is one of voluntary, informed consent. If every store uses something like this, voluntary consent is no longer possible, and this would absolutely qualify as spying.