Since paper is made of organic material, composting worms love paper and cardboard. I dampen the pages and use them as a blanket for my worms. They eat the paper and breed between the layers so it’s a good way of disposing waste paper. Mind, they don’t like glossy magazines or coated cardboard. Nothing smooth and shinny. Worms are humble and down to earth.
I don’t trust the manufactured worm farm ‘blankets’ they sell in the shops. They must be synthetic and full of chemicals if the worms won’t eat them.