It’s a jarring moment. Piyush Gupta, CEO of DBS Group is often lauded as Asia’s top financier and has been tipped as a candidate to lead global rivals. The $62 billion Singaporean bank is also held up as a role model by Chinese insurer Ping An , in its shareholder agitation at HSBC , . Yet following repeated serious failures in its digital banking services, the Monetary Authority of Singapore has banned DBS from non-essential activities including M&A. It puts dividends at risk and will attract the eye of watchdogs overseas where the lender is busy expanding.