Despite the massive growth, advancement and advantages of Bitcoin and most crypto currency, why is it hard for most countries to full accept it is or permit it's exchange?
Bitcoin is not owned and controlled by governments and central banks and Bitcoin is like a threat in view of governments and central banks. With conflict of interest, it is explainable why they don't like Bitcoin and in many years want to do many attacks in order to kill Bitcoin adoption.
you're correct since bitcoin is not owned nor control by the government and central bank so they see it as a threat, and for many years now the government had tried several times to eliminate bitcoin still dey didn't succeed. Let me be Frank here using my country for example, In my country anything that can't be controlled by the government of my country they don't put interest in that thing. Although bitcoin and other cryptocurrencies are legal in my country, but with some restrictions and only the citizens in my country are making use of them, while the government of my country is not interested in them including bitcoin.