Despite many supporters claiming that no government has control over the Bitcoin network or price (and that even if they do have control, they wouldn't hurt it due to innnovation), this seems to be proven untrue time and time again. For example, over the years, everyone labelled China threats as FUD and that they would never completely ban Bitcoin. Earlier this year China banned BTC mining, and over half of the entire network shut offline in the following weeks.
China banned bitcoin mining. They did not take control over bitcoin network. If they start mining bitcoin with billions of dollars of investment and launch a 51% attack, that would be an attempt to control. Banning is just moving their fat-ass out of bitcoin which is genuinely great for bitcoin. So decentralization of bitcoin is not compromised here. You need to understand that fact!
Bitcoin is more decentralized than we can think off. China's ban has nothing to do with its decentralization. Rather bitcoin is still surviving because it is decentralized even after China's ban.