If this was happening in Japan, I probably think they committed suicide, but this is China so I think they were kidnapped by government as punishment for crashing stock price. They’re using them as scapegoats
Some might have been kidnapped. If the disappearances all happened within a few days, then I would suspect the government. That they are happening steadily leads me to believe that the government may have taken a few but many are simply escaping to sunnier climes.