The icon for the Tencent Holdings Ltd. QQ messaging application is seen in this arranged photograph taken in Hong Kong, China, on Thursday, Oct. 12, 2017. Regulators elsewhere may be clamping down on the financial industry's use of private messaging apps, but in China the practice is flourishing. Players in the country's $11 trillion bond market use personal accounts on WeChat and QQ for everything from distributing research to soliciting orders. Photographer: Justin Chin/Bloomberg via Getty Images