For the second time in a month, Hong Kong’s de facto central bank sought to temper excitement surrounding stablecoins, warning against overly vague concepts and operations, stock speculation and money-laundering risks.Eddie Yue Wai-man, chief executive of the Hong Kong Monetary Authority (HKMA), said in a blog post on Wednesday that efforts to cool down discussions about stablecoins in the market and society over the past month required some strengthening. “We need to guard against excessive...