A currency is not the same with a medium of exchange. A gold coin isn't a currency, but it's a medium of exchange. I guess, same thing happens with cryptos. Saying that Bitcoin is a currency means that, hypothetically, it could replace a national currency if the nation said so. But it can't. Despite the fees and any other of its functionalities: It can't be controlled by the nation.
To avoid any (other) hating and meaningless replies: I AM A BITCOIN ENTHUSIAST TOO!
Ok I understood better the meaning of this post now. Currencies is a little more official term and it is used for money created by mostly by a state, so in this sense, it should be called probably crypto-money, or cryptotokens. This would be a more fitting description. Thanks for replying again and given details.