Cats are just welfare recipients. They could easily go out and hunt for food on their own, but we opened the cat food tin and they saw their opportunity to get a free lunch, snag rays on the window sill and act like surly adolescents.
My guys (all five) have unlimited kibble, but hunt all the time. (Their good luck that we live on a disused farm.) They often bring me contributions to the family larder, leaving them under my office chair. Lest you think these offerings are trivial, my boy Tumbler brought me a full grown rabbit last summer.