Ugh, I find people moralizing what animals are "appropriate" to eat or be fed to other animals without being cognizant of how their cultural context influences their view very trying. Pigs are just as smart as dogs and chickens and cows can be affectionate and pleasure-seeking, but it's okay to eat THEM or feed them/their by-products to other animals, right?
It goes without saying that someone deceiving people on Craiglist about the outcome of the "adoption/rehome"* is a total scumbag though. Come by your animal's food honestly or find a more responsible keeper to take the animal on. Primus.
*If the story is even legit, which who knows.