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"
and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"
You're totally wrong. All i know there's one country where bitcoin is legal and still using it. Its Japan and government giving support to it. Bitcoin is decentralized and not in under control, its unpredictable so how the second richest man "Warren Buffet" can say such thing against bitcoin.