US tech makes bank in China. As far as I am aware, China has never actually banned any US tech company for economic reasons, only because they are afraid of political speech on the platform. For example, Google Chrome is still very popular in China, and Windows 7 runs on a lot of Chinese computers.
China needs to deeply study why import substitution industrialization failed for many countries during the Cold War. IMO the reason was poor institutions and insufficient market innovation. China's challenge is to remain competitive in a more segregated tech world in the future.