~
They have a Great Firewall but it does work as they wanted and can not block all Chinese to access the Internet resources from other nations like Western. The pandemic shows that if their citizens want, they can break the governmental restrictions to access to other resources with freedom of speech.
Actually, I'm not talking about the potential of the rebels still moving by any means because the discussion doesn't go in that way. But yeah, they do exist. Even so, it will not make China lose.
~ If they see the whole world accept Bitcoin and Cryptocurrency mining, they will not self-kill themselves by banning that industry.
They know their nations have abundant energy resources for it and they can get profit from it too by running Bitcoin and cryptocurrency mining. China is a nation that care most about financial profit, economical benefit, their governmental power so if they see great opportunities, they will not skip it. ~
Unfortunately, economic benefits are not gained only with Bitcoin. Let's assume all countries are busy with the Bitcoin mining, China will look for business chance in it without following the trend, because they have a strong commodity to trade (
reference: https://tradingeconomics.com/china/exports-by-category).