if it's worth 0 I think it goes unfungible again because no one's willing to take it off your hands
no, no, if nobody wants to buy it that makes it illiquid. fungibility is separate
because you can't sell it because everyone knows it's the fucking Mona Lisa, but it's still the only one of its kind
if you were to make a thousand identical copies of the Mona Lisa they would be both fungible AND illiquid
because they're all interchangeable with each other, and also nobody wants to buy them
