What is it really? Is bitcoin legal or illegal in your country?

Because of bitcoin's decentralized nature, it has become almost impossible for the government to identify who are or who aren't using bitcoin. But I said almost because they can still somehow trace back the owner of an address and follow the strings.

Especially if you are using a centralized exchange, the chances of the government finding you has heightened. But if bitcoin is illegal in your country then it is most likely that centralized exchanges are banned as well. On the other hand, some people can still use bitcoin because they are very careful and discrete when making transactions.