In spirit I agree with you, but I can imagine a scenario in which someone ended up with a group of people who aren't explicitly evil but do exploit employees and end up helping their "friend" who doesn't exploit people to become a billionaire, either to ease their own conscience or for any number of selfish reasons. The person ends up as a billionaire and doesn't get rid of it in their life for whatever reasons (people usually like to appease people they know personally)

It's mostly just a thought experiment, the existence of a good billionaire, but it's technically possible for sure, even if not actually possible.