And that seems fair, in the same way that it's fair for a store to apply undisclosed quantity limits to a customer who figures out how to combine freely-availab

And that seems fair, in the same way that it's fair for a store to apply undisclosed quantity limits to a customer who figures out how to combine freely-available coupons to make all their merchandise free. I actually did something like that once. A store I visited put a link to a survey on its receipt with an offer of $10 off any one item on completion. I completed the survey on my phone, which displayed a barcode they could scan and selected a sub-$10 item. The receipt for my free item had a link to a survey.... I limited myself to a few items I actually had a use for. They would have been well within their rights to cut me off after a while, but certainly not to have me charged with a crime.