Do humans have a use besides holding paper together, or fashioning metallic objects that do so?
Is it acceptable to make paperclips out of, say, bone? Or are the humans only useful for the iron they contain (and a touch of carbon to form the alloy.)
I think a sufficiently advanced clippy would be able to do a lot more than steel.
Somewhere in the distant galaxy, Clippys post pictures of alternative uses of humans.