Peter Thiel’s venture-capital firm Founders Fund is betting on one of the largest crypto-based prediction markets even as a key US regulator steps up efforts to restrict activity on such platforms.Polymarket has raised $70 million across two rounds, with the most recent raise led by Founders Fund, a spokesperson said. The company, which also counts Ethereum co-founder Vitalik Buterin among backers, has been attracting users predicting the outcome of various events, with bets on the 2024 US presi...