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"
Yeah a bad trip for bitcoin, especially in this earlier year where bitcoin down due to many negative issues that hit. Besides it there are still many countries who refused the existence of bitcoin because they afraid bitcoin can disturb the stability of their legal currency. There is no clear regulation make bitcoin is quite worrying for investors, that's why many investors refrain themselves from investing in bitcoins because they fear about bitcoin future. All we can do now is just wish that bitcoin can quickly rise from adversity and investors can open their eyes that bitcoin is a promising investment even though there are no clear regulation yet.