To add to your point: In order for something to be unequal, it had to be obtained via unethical means. This is because the sum of morality of small transactions is transitive. Breaking it down in simple terms: If you voluntarily give your free-earned money to Jeff Bezos, it's an ethical transaction. If millions of people do it, they're all ethical transactions. If Jeff Bezos becomes a go-zillionaire, it's moral and ethical.
Meaning: If you don't want billionaires in this world, you're free to stop giving them your money at any time.