https://finance.yahoo.com/news/where-jack-ma-former-alibaba-150404612.html

Speculation has mounted over the reason behind his presumed disappearance, which some publications have connected to a speech he gave at the Bund Summit in Shanghai on Oct. 24. There, Ma appeared to call for a reform of China’s banking system and criticize Beijing financial officials for stifling innovation. “We can’t use yesterday’s methods to regulate the future,” he said on stage.