> Why are people so social and pleasant, and why are companies so egoistic (and I mean egoistic in the cancer/parasitic/enshitifying way, not in the Ayn-Rand/social/We-are-all-equal way).

It's specifically publicly-traded companies, because they cease to be controlled by real people who can make a human decision when there is a trade off between a marginal increase in profits and not being schmuck.