So how exactly is this supposed to make things better? I want to save, let's say, www.newspaper.com/import-article.html. So I must create a PR, wait for it to be merged so that I get w3id.org/my-project/newspaper-article as a redirect to the URL mentioned earlier.

Now what? What if the newspaper.com URL changes? Am I supposed to keep all my URLs up-to-date (i.e. send pull requests every now and then to update my "bookmarks")?

web.archive.org seems much more useful, by copying the entire page at the time of creating a snapshot and thereby creating a true, durable copy.