Domains cost money. Servers cost money. Updating software costs time and therefore money. Ergo, once the incentive to keep it alive is gone, the URLs change. No

Domains cost money. Servers cost money. Updating software costs time and therefore money. Ergo, once the incentive to keep it alive is gone, the URLs change. Not to mention other considerations. Maybe the expectations shouldn't be for URLs to change, rather than for them to be temporary things.