the concept of bitcoin has actually been created for a long time. but we must admit that btc is currently developing very fast. To make bitcoin recognized by each country it is difficult. but someday I believe that bitcoin will be recognized as the single currency used in the world
When bitcoin is legal in a country, it means that bitcoin can be used to pay for anything as long as the seller wants to receive it. That is not against the law.
Different if in a country that prohibits the use of bitcoin, payment transactions using bitcoin occur that means breaking the law. The difference is very clear in the regulations issued by central banks in each country.