$USDC Buying and selling U is not a crime, why did he still go to jail?

Recently, there are a lot of inquiries like this: Is buying and selling U a crime? I really can't answer this kind of inquiry, and there are a lot of them. I still say this sentence, it is illegal, not a crime!

Let me tell you first: What is U coin?

U coin is a kind of digital currency, Tether. Our country's attitude towards this currency is "not recognizing" the status of legal tender, that is, its existence is more like "items", to put it more appropriately, it is "valuable virtual props", just like playing a game and buying a prop, isn't it very simple? Why are there still so many crimes?

If you simply buy low and sell high, it's not a crime! But! Buying on behalf of others, you don't know what the money is, others transfer it to you, you buy it and get part of the "handling fee", which may be suspected of concealing the proceeds of crime and aiding and abetting.

There are also people who buy U coins with US dollars, sell them for RMB, and make a profit from them, which may be suspected of illegal business operations. Those who make a lot of money have different opinions.