404
38% of webpages that existed in 2013 are no longer accessible a decade later
(www.pewresearch.org)
This is a most excellent place for technology news and articles.
That, in and of itself, is also a problem! First of all, because such pages often fail to return a
HTTP 301 moved permanently
response, and second (but perhaps even more importantly) the reason they move is because the site transitioned from using static, human-readable URLs to some kind of unstable CMS-managed non-descriptive gibberish that breaks caching and linking. It's an intentional siloing and hoarding of content.