The author or whoever created that headline needs to look up what "gamification" means. It's the result of a design process. Reddit and Robbinhood did not change the design of the stock market. They just participated within the rules that already existed.

If the stock market is gamified, which could easily be argued, then it has been for a long time. One could even say that it's its essence. Claiming that something new happened in that regard is pure hypocrisy by the big guys who got duped by the little guys.