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"
Do you have any basis for saying that there is no country that has approved bitcoin?
I think you have to research first before saying that.