Government can't do anything because no one know who is the real satoshi.many people claimed that he is the satoshi. Also many people tried to identify who is satoshi but failed.There are many controversy that satoshi is dead.And this controversy is so old. So there is not enough proof. So no one can identify satoshi and government can't do anything Against satoshi.
Maybe after 10 years satoshi not going to come back. He is anonymous and will remain.