Many mathematically talented people I know (those who perform well in the International Mathematical Olympiad (IMO) or the Putnam competition) go into derivatives trading and finance simply because a) it's mathematically challenging b) there are answers and rewards for getting things "right" (you get more money) c) it's competitive (some of these are zero-sum games played against other intelligent market actors). I am curious as to fields they could join that would mimic this environment, but be highly impactful?
As a high-level comment, it seems bad to structure the world so that the smartest people compete against each other in zero-sum games. It's definitely the case that zero-sum games are the best way to ensure technical hardness, as the games will by construction be right at the threshold of playability. But if we do this we're throwing most of the value away in comparison to working on positive-sum games.