I doubt that the oil is actually rancid, as in like rotten over time.
It's just the hot-pressed oil from the already cold-pressed olives and their pits. Or it's oil from actually ripe olives, which is not as "healthy" for some reason.
Also the good olive oil does have a really bitter after taste, that people would really not enjoy.
Also the good olive oil does have a really bitter after taste, that people would really not enjoy.