One day when my husband and I were heading to Costco, we decided to check out a new Chinese buffet restaurant in the area. When we took look at the selections and the price, we decided not to eat there. We'd gone to several other Chinese buffets that had good food and were less expensive. Since it was the middle of the day, many samples were being served. Our lunch included a shrimp dish among other things which I can't remember now because it was over 10 years ago. I just know we had a free lunch courtesy of Costco and we ate well.
Also, a Muslim brother in my town has served hot dinner meals, including desserts to whoever lines up. He and his staff used to set up in the large space inhabited by a gas station. Now they're indoors in a new building. I've donated to his organization, which also has counseling and other free services, for several years. I'm about to send another donation because today starts Ramadan and since I can't fast, I'm obligated to feed 30 hungry people during the month of Ramadan.
Another example: My Honorary Daughter's superpower is getting free food. She'll go into a fast food place or Dunkin Donuts, especially if it's in the evening and the workers give her extra food. I've been with her when that has happened. Also, we went for lunch at a diner where I ordered the crab cake meal for the first time. The menu said it came with three crab cakes (and they were huge). They gave me four.
I know these kinds of things are probably not what you meant, but your post caused them to come to mind. One can find freebies if one knows where to look. And what about BOGOs.