A version of this article first appeared in the CNBC Sport newsletter with Alex Sherman, which brings you the biggest news and exclusive interviews from the worlds of sports business and media. Sign up to receive future editions, straight to your inbox. As prediction market trading volume booms, Truist analysts say there could be an unlikely source behind the surge. Analyst Barry Jonas wrote this week that 18- to 20-year-olds, who are too young to gamble legally in most states, could be