Despite the massive growth, advancement and advantages of Bitcoin and most crypto currency, why is it hard for most countries to fully accept it is or permit it's exchange?
Bitcoin and crypto are two different things. Bitcoin is money and a monetary protocol, while crypto includes platforms for issuing tokens, utility tokens, and many other things that are not directly related to money. Bitcoin is distinct from all of that.
Bitcoin represents the separation of money from the state and the abolition of central banks and their monopoly over issuing money. States do not want to give up this mechanism because it allows them to constantly and easily create money out of nothing. By controlling money and holding a monopoly over it, they have power over people and can finance regimes.