Just before dawn on Nov. 13, 2024, FBI agents smashed through the door of Shayne Coplan’s penthouse apartment in Manhattan, barged into his bedroom and grabbed his phone. Federal prosecutors were investigating whether the cryptocurrency-based betting platform he founded, Polymarket, where users can wager on everything from presidential elections to the identity of the next James Bond actor, was violating laws designed to prevent money laundering. Fourteen months later, the fortunes of the shaggy-haired 27-year-old couldn’t be more different. The Justice Department has dropped its probe. Donald Trump Jr., whose venture-capital firm is an investor, joined the company as an…

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