There are local China subforums in Bitcointalk and Bitcoin have total ban in China, so forum admin probably will be arrested and transfered to China in future.
Bitcoin is prohibited in China, ok it's fine for other nations that are not China and not under Chinese government regulation.
There are many nations globally and not many of them have extradition agreement with Chinese government. Without an extradition agreement, a national government will not arrest a person and extradite him to China.
China banned Bitcoin mining and caused a Great Hash rate migration to other nations like Iran, USA, Canada but do you read any news or report that Chinese people were arrested because of Bitcoin?