I don't really understand, I used to think that a cryptocurrency unit was non-fungible ? As I'm a computer scientist many of my friends ask me questions about cryptocurrency and nfts, even though I know nothing about it. Five years ago, I learned the basics so I could answer, and I understood that one specificity of a cryptocurrency was to resolve the double-spending problem.
In that sense, one cryptocurrency unit was fundamentally unique, not duplicable, if you try to use it twice or to copy it, it wouldn't work. I even explained it to some friends with a parallel in art world : if you had one piece of art associated to a block in a blokchain, you couldn't duplicate it, but only trade it with another one, and you would always know that it's specifically this one and not another one.
Now, I hear a lot about the NFTs, especially the ethereum ones, and it seems to me that it describes exactly this situation : a unit that is unique, and specifically identifiable.
The only difference I can think of, is that because of the idea associated with one unit when it's a coin, nobody cares to posses the coin A or the coin B as long as their value is identical (1 ether for example), but if the unit is a piece of art the value is dependent of the sociological and cultural context, so we care to exchange one "bored ape" with another.
Am I wrong ? Is there a technological distinction between cryptocurrency and NFTs ? Or is it a different application of the same technology ?
It seems to me that coins are non-fungible, but we don't care (except for real coin when there is a special limited edition, then a 1$ coin can have a value of more than 1$)