Too Right Rumpig.
It should be banned, and I thought it was. An interesting history lesson can be had spending a day on Lake Mulwala. It is covered in old dead river gums, and I tried to find one without a roofing nail in it and couldn't. There are thousand of trees, and almost every one has up to 4 roofing nails in it for attaching set lines. The ones that are used now are underwater. The old green cord is still used too. Surely those big green fish deserve more respect than that.