Let's say you have a website at coolsite.com. You may or may not own that domain.
For some reason out of your control, coolsite.com is gone or shutting down forever. You move to newpage.net and start putting your content there. You even import your old content.
But all the links to your old content are broken forever and there's nothing you can do about it.
Do we throw our hands in the air and exclaim that "websites are dead, this will never work"?
No, because it's clear that they still work fine after 30 years of this happening over and over.