Maybe that is the reason why China government does not like bitcoin and tends to prohibit bitcoin. But hopefully, that is wrong because we do not know if that is just camouflage to other countries that they do not like bitcoin. We do not know if their government uses bitcoin secretly without anyone knows and their people still mine bitcoin under the government radar. If they really do not like bitcoin, then that will not be a problem because the other countries will still support bitcoin. And if the China government still does not allow their people to use bitcoin, they will regret it when the situation changes in the future.
Tax evasion is a serious threat in the crypto world, if you could somehow put your money into crypto before you put it in any legal place, then you could avoid taxes as long as you do not claim that money. Since crypto is also something that is profitable to hold for long term, many very wealthy people could maybe use it to put their crypto in hidden wallets and protect their wealth without paying taxes at all.
I do not know how long that will go on, there could be some people who will get caught eventually. China wanted to prevent that beforehand, they are a dictatorship and people hiding their money is not something they could allow, that would look like weakness and they couldn't allow to look like they have a weakness.
Yes, that is because if someone is doing illegal activity, they can easily send the "hot money" to the crypto and keep it in a separate wallet and we know that we have so many wallets that give that function. I guess the government is already searching for people related to crypto and asking them many questions related to crypto. And maybe the government decide to watch close to that people so they can know what their activity.
China's government, with its power, can make sure they can monitor all activity of their people because they want their people to follow their rules and not trying to do something that they do not like. They will hide their weakness from all, including other countries, to see that China is a strong country. But hopefully, they will realize that their people need something better for their lives and allow people to do something that can benefit them.