I know. Author should have mentioned the unused body parts came from livestock because that is NOT the image that popped into my head at first.
My thought was "wow, well that's certainly a dark comedic way to illustrate the author's point"
No clue it was on animals
If you don't have a factory-level meat industry doing it all-in-one, processing material that otherwise would be discarded is a niche for one-person businesses.
Although it made me scratch my head a bit. I was mostly wondering how they avoid diseases associated with eating brains. Mad cow disease spreads from animal to human mostly by eating brains.
Yeah, in Bali, the dogcatcher sells the dogs caught to people as food.
But there's rabies (and more) in the dog population there, so ...