I think making regulations must pay taxes if we have bitcoin or cryptocurrency that is something that is not clear because the tax cannot recognize people who have cryptocurrency or not. if you are asked to pay taxes, then just say you don't have it.
Just wonder how government will track each person in their country. Which one is have and which one is not. Maybe that thing will be problem again for government and we as investor only need to say like what you said, we don't have any crypto.