The online brokerage is adding parlay-like opportunities to its prediction market platform. Since online brokerage Robinhood (NASDAQ:HOOD) launched its prediction market platform just before the 2024 presidential election, the service has taken off. It has become Robinhood's fastest-growing product line in roughly one year. In the third quarter, the prediction market generated $100 million in revenue, which is about 8% of the $1.27 billion in total revenue the company made. It helped the company achieve rec ...