If you print a web page the links are still there. The icon tells you "this here was a link" and you can go to the computer and look it up. If the link wasn't u

If you print a web page the links are still there. The icon tells you "this here was a link" and you can go to the computer and look it up. If the link wasn't underlined and had a different colour but you printed in b&w it might be the only way to know that was a link, so I would argue that the icon is more useful in paper than on a live web, actually.