A bit strange considering the circumstances in China and how the government has essentially vowed to shut all crypto businesses down.
The fact that still the majority of bitcoin's hash power is there is intriguing to say the least.
I personally do not see anything strange in the fact that China has a different stance on crypto trading and crypto mining. There is at least one good reason why China sees no danger in crypto mining, they can control that process completely and they make a huge profit on it. Miners sell Bitcoin to pay for electricity costs, and large amounts of that energy are actually surplus from hydroelectric power generation. It is a win-win situation for China.
Of course, it would be better to distribute the hashpower more evenly, but mining is a business that depends on cheap electricity, and currently, China is the country that can offer the lowest prices. I'm not sure how accurate the data is, but research has shown that the average cost for mining 1 BTC in China is around $3000.