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"
Do not be easy to believe by someone's thinking. Because the richest person is not our benchmark for making decisions.and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"
Bitcoin is already Legal in some developed countries. For example Switzerland and Japan. And Japan holds the largest amount of Bitcoin today.