Polymarket’s Rush to Grow Left a Door Wide Open For Fraudsters WSJ - Business By: Caitlin Ostroff Katherine Long Neil Mehta 20 September 2026 at 01:00 CEO Shayne Coplan brushed off concerns about a scheme involving stolen debit cards. Now the prediction market is bolstering its executive ranks as it eyes an IPO. © Alexandra Citrin-Safadi/Elizabeth Coetzee/WSJ
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