There are number of websites (Wikipedia, Lobste.RS, some subreddits, ...) which do archive all new outlinks in an automated way.
Why content preservation is not very popular among webmasters (why NH and 1000000s other sites do not do it?) is an interesting question for Internet philosophers.
Maybe, because people mostly want the shit to sink and not come up again?
Also, why web-archiving is biased right-wing?