SHANGHAI, Dec 1 (Reuters) – Hong Kong-listed stocks with businesses related to stablecoins tumbled on Monday, after China’s central bank vowed to crack down on virtual currencies and flagged stablecoin concerns. Yunfeng Financial Group slumped nearly 10%, Bright Smart Securities and Commodities Group dropped roughly 7% and OSL Group lost more than 4%. The People’s Bank of China (PBOC) reaffirmed