Who cancels lunch with Warren Buffett? A Chinese tycoon did, but why?

Everybody knew where Justin Sun, a brash Chinese millionaire and cryptocurrency celebrity, was going to be this week. He had paid a record $4.6 million to have a charity lunch with Warren Buffett, the investing guru, in San Francisco, and he was counting down the days on social media.

Then Sun, citing ill health, postponed the lunch three days before it was to happen, sending the Chinese media and internet into overdrive. One outlet reported that he would be held in China once he returned while the authorities investigated his financial dealings. Another asserted that he had never left China in