Yes bitcoin is totally legal, only that there are no official ways to proove that if you withdraw your profits to your bank account, those funds are for bitcoin, because it happened to me.
Once i withdrew more than $3k to my bank account and i had a lot of questions from the bank and if i didnt clarify that i was going to go jail because of "money laundering"
but yes, bitcoin is totally legal, only that there are some issues about it.