Are you British? Generally supermarkets in the UK are usually quite community oriented. They often have collection boxes where you can buy an extra item of something you were going to get anyway and they give it to charity, and host other local charity initiatives sometimes. They even have a signboard in my supermarket with local community news and stuff. I believe most food stores give away surplus expiring food to homeless shelters (it says Tesco already does in the article). Giving it away in store is new and welcome but not without precedent. Some stores have a free fruit section for kids already for example.