Is buying and selling virtual currencies illegal??

If you make money from buying and selling virtual currencies, could it be confiscated or fined?

In fact, according to national regulations, virtual currencies like Bitcoin are not considered real currency, but they can be traded like goods sold online, as long as individuals bear the risks themselves.

Just like when you buy something online and make a profit, who would come to confiscate it from you?

So why are there times when buying and selling virtual currencies leads to arrests or even imprisonment?

Although buying and selling virtual currencies is not illegal in itself, if it involves illegal activities like money laundering, that's a different story.