The legality of bitcoin depends on who you are, and what youre doing with it.
There are three main categories of bitcoin stakeholder. Someone may fall under more than one of these categories, and each category has its own legal considerations.
If in my country Bitcoin is not yet legalized, but the Government in my country still allow its citizens to have Bitcoin and only prohibit it to be used as a transaction tool. So Bitcoin is still legit in my country.
Here it is considered legal because there is no regulation stating that it is illegal, so we are free to do what we want for as long as we are not fooling people to do investment in it, or to make an investment scam because we do have law regulated for the protection of everyone especially investors.
The same as here, since our country recognized bitcoin from our Central Bank as one of a currency payment and making a transaction as a virtual money we all concluded that bitcoin is not illegal here besides many people now embracing bitcoin because of the asset of bitcoin being profitable when you invested. But fooling people was really prohibited here and have a punishment when you are being caught and have strong evidence on you and that is part of cybercrime law and money laundering.