Interactive Brokers founder Thomas Peterffy on the company's plan for prediction markets https://www.bloomberg.com/news/articles/2026-04-09/thomas-peterffy-on-ibkr-plan-for-prediction-markets?taid=69d75db55fcb6f0001a6e48e&utm_campaign=trueanthem&utm_content=business&utm_medium=social&utm_source=twitter