Bitcoin is legal in a number of countries such as Russia, South Korea, the United States and a number of other countries, and it is said that Southeast Asian countries have not legalized crypto including my country that has not legalized Bitcoin or has not been legalized. but Bitcoin is also not rejected.
the conclusion is that Bicoin is legal or not, depending on the policies of each country.
Bitcoin is a digital currency that can conduct transactions between countries, both in countries that legalize bitcoin and those that prohibit bitcoin. The system being carried out is peer to peer and decentralized, so that even though being in a country that prohibits bitcoin transactions can still be done because everything happens online.
In developed countries bitcoin is legal, but in many countries that are still poor bitcoin is illegal. So that bitcoin users are divided in some established countries, because the community and its equipment are adequate. In poor countries it is considered illegal for fear of disrupting financial transactions because bitcoin cannot be monitored.