An artist should credit when they are directly taking from another artist. Erasure poems don’t quite work if the poet runs around claiming they created the poem that was being erased.
But more importantly SD allows you to take and use existing copyright works and funny-launder them and pass them off as your own, even though you don’t own the rights to that work. This would be more akin to I take a photograph you made and sell it on a t shirt on red bubble. I don’t actually own the IP to do that with.