This to me is part of a general trend wherein only those with the awareness and resources required will have privacy. For example, if you do have the funds, send a private shopper. But an even more direct example is skipping the discounts associated with club cards for privacy reasons. This will further entrench the class divide between the wealthy and the rest of us.
Why should I care to keep what I buy at the grocery store private? I'm not trying to be flippant with this question. I'm just honestly perplexed why this is an important dateset to keep private. Also, why would I want to avoid discounts? Grocery stores are one of the few places that gives me money for handing them my data. Isn't this good behavior!?
By making the decision that it's fine today, you're also deciding that it's always going to be fine in the future.