Bitcoins in general are banned in China, but still they can mine (that's a huge profit anyway with rewards (transaction fees) they get), plus they own almost the whole FPGAs / ASICs market (at least for quantities), those are devices specifically designed and made to mine bitcoin and other cryptos, used by any farm (and also private / small miners) miners with hundreds of pods full of those, and they cost thousands each, both R&D and manufacturing of those device is pot of gold, developing a single processor from design to production costs hundreds of million in euros