Link-rot has been a problem on the SE sites, and will probably always be. This is one of the reason why link-only answers are highly discouraged and on most sites get converted to comments (or if that is too much work simply deleted). On scientific sites such as these, in many cases this can be avoided by simple strategies:
- Use persistent links. These are not always easy to come by though.
- Link through a DOI and include a human readable citation. The latter is also nice to maybe find an open version of the article.
- When uncertain, bookmark it in the Internet Archive. If you are referring to specific data, values and whatnot, time might be of the essence. It takes a minute to 'eternalise' a website. Someone 10 years from now might thank you.
- Be verbose with your sources. Instead of leaving a link tacked on to the word source, you can write the name of the website.
- Always upload the images you use to this platform (make sure you have got the rights to it).
If you have more strategies, please add them.