A friend of mine found a loophole at a burrito shop as well. They had some old points system where you’d have to go to a url on the receipt, and enter a code for a free taco. Eventually the promotion ended because they stopped printing the URL, but they never shut down the webpage either. So he continued to get free tacos from the old webpage, but whatever proof of purchase was needed could be used from the same receipt used to get the previous free taco. He doesn’t do it too often so no one catches on, but he would eat for free there once or twice a week.
A friend of mine found a loophole at a burrito shop as well. They had some old points system where you’d have to go to a url on the receipt, and enter a code for a free taco. Eventually the promotion ended because they stopped printing the URL, but they never shut down the webpage either. So he continued to get free tacos from the old webpage, but whatever proof of purchase was needed could be used from the same receipt used to get the previous free taco. He doesn’t do it too often so no one catches on, but he would eat for free there once or twice a week.