I agree and disagree. While it is closest to a "crypto-currency" when referring to familiar tokens, none of the cryptos are technically "currency" at all.
Steem and SBD are "digital tokens" or "virtual tokens" that can be exchanged for fiat currencies. Even more correct than "token" would be "credit" akin to Star Wars.
I would like to see digital tokens be accepted as "credits" in this way where I could simply use my card to spend universally accepted money at any retailer worldwide.
Unfortunately there are more digital tokens than there are world fiat currencies, and while all of these are based on an "agreed upon value" it makes the idea of universal acceptance a hassle on the side of merchants. As a merchant myself I find it difficult to accept both cash and credit cards, let alone over 500 digital tokens with values that can change several times a minute.
This circles back to why it should be called a token or credit instead of a currency. It is not as stable as currency and in most cases needs to be exchanged for currency before it has a "real" value.
Just my ...