most countries are protecting their local currencies by not defining Crypto currencies as currencies.... they define it as a Commodity. Their reason for this is simple, if it is a commodity... then it cannot be a threat to their Fiat currency.
The problem with that is this... Commodities can also be a currency. Take Forex trading for instance... you trade "currencies" as a Cmmodity, but you still use it as a currency.
Money didn't exist thousands of years ago. The whole concept of currencies/money developed from people bartering with commodities. One commodity tended to become the most popular to barter with, for a variety of reasons. Traders started to use a different word to describe that most-popular bartering item, and so we ended up with something called "money".