We know that China already banned all Cryptocurrency exchange and ICO at the end of the last year. Chinese Cryptocurrency exchange has already moved to other countries. Due to Chinese ban, we have seen negative market reaction before. It is now obvious that China already took the final decision against Cryptocurrency.

China took all possible measures to stop the rise of Cryptocurrency in China. Now it is taking action against Crypto Mining. It seems that China is determined to wipe out everything related to Cryptocurrency. The reason is very simple. Let's find out the definition of Cryptocurrency from Wikipedia

A cryptocurrency is a digital asset designed to work as a medium of exchange that uses cryptography to secure its transactions....Cryptocurrencies are a type of digital currencies, alternative currencies and virtual currencies. Cryptocurrencies use decentralized control as opposed to centralized electronic money and central banking systems.Source

Yes, Decentralized nature of the Cryptocurrency is the main reason behind the ban. The Chinese government is threatened by the Decentralized Digital Currency. Till now, China is the only country categorically banned Cryptocurrency and Cryptocurrency related matters.

Is Government Successful?

I am not sure about this. If you look at the statistics from the different exchange, It is obvious that Cryptocurrency ban is not working. Look at the web traffic in Okex and Huobi pro, most of the web traffic is coming from China.