well, it's true Bitcoin ban in china but that doesn't mean's that Bitcoin getting ban in every single country. The majority of countries do not make the usage of bitcoin itself illegal as well as some countries have explicitly allowed it's use and trade, others have banned or restricted it such as China.
you also can see this here say the the legal status of bitcoin https://www.forbes.com/sites/kashmirhill/2014/01/31/bitcoins-legality-around-the-world/#3d359f853ccd