Studies of link rot reach the same conclusion: a large share of the web disappears within a few years. The article you bookmarked about a market move, a breaking story or a piece of research may not exist at that address in five years. If it sits behind a paywall, it may already be out of reach.
WHT.day saves the article itself, not just the address. One click on the browser extension captures headline, author, publication and the full text, filed under the day you saved it. The original link is kept for reference; your copy no longer depends on it.