Bitcoin is not legal in all countries of the world. there are still countries that do not want bitcoin and crypto. I think the first reason is because of the banks of different countries because we know they are related to the currency so they block bitcoin in their country.
Indeed, each country has its own policy, this depends on the country. So not all countries accept with all reasons, but many countries accept it so that they are free to develop crypto.
Guys there's google to find your and ask your problem there for free like this one.
Almost every country has it's own rules so i consider if you do ask someone from your country to know the basic rules or laws about of owning bitcoin.
https://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country_or_territoryYou just need to find it there if you don't know it yet, google is quite useful in almost everything that you don't know yet.
Almost newbies doesn't find google as an interesting answer to their questions.