The existence of bitcoin is still pros and cons, many things must be understood and studied well. Indeed bitcoin has not become an official currency and it still has a mystery because not everyone knows about bitcoin especially to get it. Not all countries accept because they see unstable prices, anonymous users and also many things that are less acceptable by government regulations.
I think the reason why bitcoin isnt a legit currency is because it is decentralised in nature where in no other third party including the government could control it. Bitcoin is not regulated by the government. Who will make something legal without having control in it. Well this is just my opinion.