:)Bitcoin was launched in 2007. It's 12 years and still no country has approved Bitcoin ?? Huh
It was actually invented in 2008 and launched in 2009 by Satoshi. It totally depends on what "approved Bitcoin" means to you. If you mean adopting it as a national currency, it's close to impossible due to the fact that governments do not have any kind of power in this economy.
Other than that, while there are some
countries hostile to Bitcoin, there are many, many out there allowing its usage even as a method of payment. Regulations helped make that happen, but while on the other hand attacking privacy from multiple sides.
and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"

If he's your idol and you take his word for granted as if he was some crystal ball, then do so. But I wouldn't if I were you. Bitcoin could end up badly the same way Buffett's portfolio could. It's all about what the future reserves for us. John McAfee has said years ago that Bitcoin would either hit $1M by the end of this year or he'd cut his d*ck and eat it live on TV. Would that be convincing enough for you that Bitcoin is going to make you rich? It wasn't for me, and it seems like he either has to eat his own sexual organ or he'll just take it as probably the biggest L of his life.
Influencers and billionaires aren't Gods. They only have masses they move to the directions they want. I'd honestly recommend you not to be part of those masses.