The mainland Chinese are able to product cheap parts for miners with cheap labour and they have almost free electricity in some parts of China. With the right connections and the right amount of money, nothing seems impossible in mainland China.
China got the biggest mining rigs for the business and they are operating profitably, and that is good to know that there are big miners that will continue to support bitcoin so we will live longer and we will not be destroyed.. By the way, the price now is great so bitcoin is basically not DESTROYED.