A Polymarket trader just pulled off an eye-catching move: turning $1,000 into $2 million through microstructure arbitrage. The strategy? Executing over 13,000 high-frequency trades to capitalize on market inefficiencies and bid-ask spreads. This kind of trade execution showcases how precise timing and algorithmic approaches can exploit brief opportunities in prediction market microstructure. Whether this approach scales beyond individual traders or requires institutional infrastructure remains an open question in the community.