I would ask a counter question: If China, Black Rock, Elon Musk or anyone able to take control of Bitcoin, why they didn't do it till now? mining rigs are limited, even they have a lot money they can't own a lot mining rigs. If they want to buy mining rigs from other miners, not all miners will want to sell their rigs.
China didn't ban Bitcoin from their society, and it's still perfectly legal for individuals to hold and trade Bitcoin in China. The only thing they did is forbid their banks and financial institutions from holding Bitcoin on their balance sheet.
Says who? China and Hong Kong are different, China completely ban Bitcoin while Hong Kong accepts Bitcoin.
SHANGHAI/LONDON, Sept 24 (Reuters) - China's most powerful regulators on Friday intensified a crackdown on cryptocurrencies with a blanket ban on all crypto transactions and mining, hitting bitcoin and other major coins and pressuring crypto and blockchain-related stocks.
Ten agencies, including the central bank, financial, securities and foreign exchange regulators, vowed to work together to root out "illegal" cryptocurrency activity, the first time the Beijing-based regulators have joined forces to explicitly ban all cryptocurrency-related activity.