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"
In the EU, transactions using bitcoin are considered legal. Similarly with the G7 countries (Canada, France, Germany, Italy, Japan, Uk, and America) have legalized bitcoin. Neither with other countries. Most bitcoins are considered legal and can be used in transactions as a means of payment, traded as commodities and exchanged for regular currency. But there are some countries that are also firmly to bitcoin. Like Bolivia, for example, in 2014, Bolivia's central bank has declared it official to block bitcoin. In Ecuador bitcoin is also considered illegal. Not just bitcoin instead, but also other digital currencies. the government prioritizes transactions with the use of local currency that is the government-regulated dollar.