Exactly they saw the opportunity and adoption rapidly. Chinese  are on the top on cryptocurrency mining since the beginning with companies like bitmain and bitwei. Also very interesting point to be observed is they have 12 block producer out of 21 of EOS blockchain too. Due to all this china have upper hand in terms of cryptocurrency dominance and other countries are lagging behind like USA. I think USA is politically very strong and there are several news roaming around the USA administration will utilise XRP to counter China's dominance.