This will probably crush Bitmain and other Chinese bitcoin mining giants and they will probably move elsewhere, however Chinese courts have said bitcoin itself is legally allowed. Probably what is going to happen is that you can own but you can't mine or even obtain more bitcoins in China. https://www.ccn.com/chinas-merchants-are-legally-allowed-to-...
Bitmain makes huge margins on selling equipment, not mining. They make shovels in the gold rush.
Best part is that they are well known to take an order and payment from a customer and then ship out machines they've been using themselves for the last few months. I've gotten machines from them that were definitely used equipment. They say that they do 'testing' with them first as an excuse.
[0] https://www.coindesk.com/bitmain-bitcoin-mining-farms-antmin...