It’s pretty badly targeted. Lots of poor people don’t have much time, and lots of better off people have lots of time and enjoy things like screwing around with coupons to get a discount. It also doesn’t do much for extreme poverty. If you have no money, it doesn’t matter if you can get a coupon for half off a loaf of bread or whatever, you still can’t afford it. So you end up giving more help to people who need it less.

If you want to help poor people buy food, give them money to buy food.