> People usually become billionaires via having “super-powers,” i.e., very unusual abilities, at least within some context.

There are certainly sometimes unusual abilities in a positive sense, but the common case likely falls closer to having an unusual degree of sociopathy. It is unclear to me how else one could view the state of perfectly solvable human suffering in the world and continue to prioritize accumulating wealth over all else, moreover and overwhelmingly at the cost of being party to the suffering itself. Indeed, I suspect having such callous disregard for your fellow person is prerequisite to encountering these unfathomable sums.

When people with an intact capacity for empathy come into huge amounts of money I think it's far more common to give a large proportion of it away (say, Jane Street workers have a culture of doing this). And thus you only stay 'comfortably' wealthy, rather than accumulating so much that it distorts society around your singular existence.