Bitcoin was launched in 2007. It's 10 years and still no country has approved Bitcoin ?? 
and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"
there are some countries that approve the bitcoin and they are countries that encouraging there people to use bitcoin, my opinion bitcoin will never end because of the demand of the people from 2007 till now bitcoin helping some people who are studying bitcoin and have learning on it. maybe there are many countries that not legal the bitcoin than the countries that approve the bitcoin 2018 is the open for opportunities for other crypto currency.and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"