Call me naive, but isn't this essentially uncooked meat? Reading how prosciutto is prepared now, and I don't see any cooking involved, just salting, pressing, and letting sit, sometimes for years. Leaving food out for years at a time should make it accrue mold or etc.
Why doesn't it go bad, and why is it safe to eat? This isn't just for prosciutto, but soppressata, capicola, and more.
FWIW, these are some of my favorite things to eat in or accompanying a sandwich. I just don't grasp how they don't make you sick as raw meat would.