the practical thing which makes it not a currency is that buying and selling with it is tied to cards and not, like, a market. also, the difficulty of converting other stores of value into it. (but the joke the anon was making was that, especially in a liberationist city, it really feels like it's another flavor of <a href="/wiki/No_Currency" title="No Currency"><img alt="" src="/w/images/thumb/7/71/Black.png/20px-Black.png" decoding="async" width="20" height="26" srcset="/w/images/thumb/7/71/Black.png/30px-Black.png 1.5x, /w/images/thumb/7/71/Black.png/40px-Black.png 2x" /></a> <a href="/wiki/No_Currency" title="No Currency">No Currency</a>)