Not all country bitcoin is illegal, Some of the country still have the access bitcoin. I think why some government illegalize bitcoin because they think that they cannot earn. Like there is no kickback to their country. Every money coming in a country it has a tax for the government while if you invest or sell bitcoin, there is no tax for the country even it is overseas transaction. But still i didnt know the economic industry so that is only my prediction. And another think that bitcoin is illegal because you can use it to buy some illegal things and thats true.