Prediction Markets Let You Bet on Anything. That's a Problem

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In late May, federal authorities charged a Google software engineer with insider trading after he won $1.2 million on the prediction-market website Polymarket. The 36-year-old Michele Spagnuolo allegedly placed bets that musician D4vd and rapper Kendrick Lamar would top Google's most-searched list. The bets paid off, prosecutors said, because Spagnuolo had access to confidential company data.

The popularity of prediction markets, where you can bet on thousands of real-world outcomes across nearly every facet of modern life, is spreading faster than governments can keep up. Even Mark Zuckerberg, Meta's chief executive, is reportedly developing a standalone prediction market app to compete with the most popular platforms, Kalshi and Polymarket.

You may have even been tempted yourself to put down cash on your favorite pop-culture hunch. But the recent Google case highlights just one of the biggest concerns for a multibillion-dollar industry prone to abuse. Numerous insider trading cases...

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