I'd call it a unit of exchange for things which really are scarce. And even if we do do think of it as something which we have artificially imposed scarcity on,

I'd call it a unit of exchange for things which really are scarce. And even if we do do think of it as something which we have artificially imposed scarcity on, this is an exchange process people opt into willingly. You're still free to consider it non-scarce and worthless. Unlike IP, which is for restricting use by people whether they want to opt in or not.