when we say china its only a country,and china is a big place.yes china banned almost everything about crypto but chinese didnt stop at all...most chinese are in taiwan,macau,and hk which is not affected with the crypto banned in mainland.the reason why chinese still holds a big part of crypto world.and china is aware about that so i guess the reason they are interested in making their own blockchain tech and own coin. just like what they did in google,facebook and other social media,they make their own version to still hold and control their people.