At the point you create the data, you don't have link rot. At the point you create the link rot, you don't notice it. At the point you notice it, you don't have

At the point you create the data, you don't have link rot. At the point you create the link rot, you don't notice it. At the point you notice it, you don't have time to fix it. At the point you try to fix it, you don't have a full list of rotten links. And those who keep starting the cycle by creating links don't care that ends up this way because there's no immediate impact on their silo. Thus to fix it, you need an organisation-level project, but it's hard to identify what business value you get from it.