In my humble opinion here are a few business models that are just plain evil:
-Lottos. They are a tax on poor people who are bad at math.
-Government. They don’t care whether you want their services or not, they will hold a gun to your head and force you to buy anyway.
-Cigarette sellers. Addiction is a powerful creator of demand and can make you rich, but killing a generation of people with cancer for profit is disgusting.
-Get rich quick schemes. Preys on wannabe entrepreneurs stealing their capital and twisting their ideas.