John Oliver, the host of "Last Week Tonight" and "Last Sunday", has exposed the dark side of prediction markets, where users can bet on events such as war outcomes. He criticised companies' insistence that they are not gambling sites but important for accurately predicting the future. He also highlighted their partnerships with news organisations such as Dow Jones, CNN, CNBC and Fox News, and their ties to Donald Trump’s White House through his son, Donald Trump Jr., who serves as an adviser to both companies. Oliver promised that he would never act based on a bet on an upcoming event.