The deal is that china has a lot of bitcoin in its nation, we don't know how they can move it outside the country but the miners, the traders, the ICO participants and everyone else in that nation wants to cash out their crypto currencies and sell it to each other, they earn it from other nations and people from all around the world but then exchange it between themselves.
So, if China was smart even a bit they would have collected the crypto profits in crypto taxes in form of crypto to build a new vault for themselves and in case a country wants to apply an embargo or a trade war like USA wanted to they could just simply sell all their crypto they collected via taxes and could get dollars for it instead of yuan and then sell those dollars to drop the value of it as well. Its smart, its cunning and it would make a nation super strong in economy against others.
I don’t understand man, how can they build vault for what is not physical, cryptocurrency is digital and they don’t need to build vault to have it saved or have difficulty in moving it outside the country no matter how large the amount is, I think they have been doing this easily which china itself has not been able to successfully control its technology as a result of its anonymous nature.
I believe that this is the reason why they thought of bringing the attack from the angle of miners, since they know that majority of the miners of bitcoin and other cryptocurrency are from china, so if they can limit their mining power, then they can limit the supply of cryptocurrency flowing round which will make it difficult for people to acquire crypto and them becomes difficult for them to move money out of china.