most soybeans are grown for use as animal feed
in fact, most soy beans are grown for oil, and even what is fed to livestock is mostly the byproduct made by pressing beans for oil. but even beyond that, cattle only eat about 7% of the total global soybean crop.
a soybean is only like 1/5 oil. after we’ve extracted the oil, feeding the meal or cake as it’s variously called to animals is a conservation of resources.