I think bitcoin is a world currency not a private currency and because he does not hold by the government and does not have tax.. and i am agreed for this currency. so all people are wrong tell us bitcoin is a private currency.
Yes I am agree with you. When you say private it means only limited persons can used that currency and it will not.be in public and it can be used in lots of transactions. Just like what you said Bitcoin is a world currency or a public currency which is many people can do used or earn to it. As of now, Governmeng can not applied taxes because until now they are research about it and it needs to be more popular in many countries