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.
in some countries bitcoin is legalized and some other countries prohibit it. there are also some countries that have not yet determined their response. does not mean it is prohibited. my country still hasn't determined its response. so I'm still free to use it. each country has its own rules mate
some countries are bitcoin is legal but some countries hide transaction because that countries are not legalized the bit coin