I remember Jeremy Keith talking about this at dConstruct conference; he put a bet on Long Bets that the URI of the bet wouldn't change [0]
[0] - http://longbets.org/601/
[0] - http://longbets.org/601/
http://www.npr.org/2016/03/10/469897691/armed-with-an-index-...
2. The winnings (plus growth) are awarded with fanfare to the winner's preferred charity. The winner, if still alive, can change charities if desired (but not to multiple recipients). If the winner is no longer alive and the originally designated charity is gone or drastically changed, Long Bets may award the winnings to a charity deemed closest to the winner's original intentions.
> A 301 redirect from www.longbets.org/601 to a different URL containing that text would also fulfill those conditions.
> …entering the characters http://www.longbets.org/601 into the address bar of a web browser or command line tool (like curl) OR using a web browser to follow a hyperlink that points to http://www.longbets.org/601 MUST …
The bet (and the referenced article) is about the availability of the resources at the end of those URLs - the URL itself is just a reference, or a pointer if you will to a resource.