Hunter Guo spotted what seemed like a guaranteed win on prediction market platform Polymarket. The 20-year-old Kings College London student wagered on whether Strategy would sell bitcoin by May 31, buying thousands of contracts after the company disclosed sales on June 1. He planned to buy a Porsche with his profits.

Polymarket then issued a unilateral 'clarification' wiping out his position within seconds. The platform ruled Strategy's disclosure didn't count because news had to break by 11:59 p.m. ET the previous day. Guo lost $35,000—money he couldn't afford to lose as a student. He told reporters he cried for two days after the sudden reversal.

The incident reveals a controversial practice in the fast-growing prediction market sector. Platforms routinely issue clarifications to address ambiguities in how contracts settle, often when real-world events don't fit clean yes-or-no frameworks. Critics argue this effectively changes the rules mid-game, disadvantaging traders who've already committed capital.

These platforms operate with minimal oversight, leaving users vulnerable when operators reinterpret contracts after bets are placed. The lack of standardized dispute resolution mechanisms creates systemic risk for retail investors chasing yield in volatile markets.