An example of an energy waste link
As you can see I am visiting a website here it is
I got it by doing this google search
As I was writing about Squidoo because you may guess that Squidoo was the case of my precedent episode about dead websites. You can read it here. For this short-form article, I went as commonly to google looking for new information and for remembering the story. As it is a past event, it was clear that the article on the webpage I was going to read would be outdated. You can see it with the date of this article I gave you in the screenshot (you can look screenShot Story article here also). I rade the post and it has a lot of links into it like this one that I underlined in red
When I click on this link I got a 404 pages like that
Excuse me because I clicked again on the link to make the screenshot above so I landed again on a 404 page which is very bad.
These two clicks were clearly a waste of energy because since 2014 we made nothing to keep this link still consumable and relevant to the webpage that links it. Showing an alternative webpage that for example could say something about the topic for the benefit of the visitor and the website that was linking this content. For deadlink which is fixing such an issue doesn't expect any benefit other than making the internet cleaner and more energy-efficient.
I was linking to this webpage I would increase the likelihood of getting another person to click on this dead link and wasting energy again. So 404 safe and smart websites matter a lot in linking and search ranking.