Let's say you make extras of dinner. You don't want to eat the same thing for several days and maybe you don't like freezing the overage. On the flip side, you don't want to toss it out. Waste not, want not after all. You can put your leftovers up for grabs to someone local.
You could also be on the receiving end. Check the app before you cook or order out. Save time and money and only have to pick up.
Would you do it? What are you concerns if you wouldn't?