Bitcoin was still illegal to some country, because its not recognize by the government constitution of law and they will not allow bitcoin to be a legal currency. Because  in each country has only one recognized currency which represent to every countries identity.. Bitcoin don't have own country identity. Just like peso it represent the Philippines, YEN represent the country of japan. And other currency represents their country. But unfortunately Bitcoin don't have. I think this is one of the reason why some other countries bitcoin is still illegal.