Prediction markets Polymarket and Kalshi have announced enhanced anti-fraud measures during the World Cup to address rising fraudulent activities. As both platforms expand their range of tradable events to include more real-world occurrences, they aim to boost market participation and liquidity. However, this growth has also led to an increase in fraudulent activities. Kalshi reported an annualized revenue of approximately $1.5 billion in May, highlighting the significant scale of its operations.