The Golden Shield system controls several directions at once: informs about offenses, controls content, deals with users identification, information monitoring, and traffic management. The Great Firewall of China, a part of the Golden Shield, blocks unwanted Internet resources, such as WhatsApp, Facebook, Twitter, Youtube, Instagram, and Google. Sites criticizing the Chinese authorities are also blocked.
It should be understood that the whole system would not be so effective if China did not create successful national versions of global Internet services that became unique platforms (Taobao, AliPay, etc.), and the domestic market did not become the largest in the world.