▲ ▼ Link rot, Invalid web URLs
Link rotting is when a particular URL is not valid anymore, Usually because the content has been removed. Link rot is an issue we face with needgap as the majority of links here are of side-projects and when the project unfortunately ceases to exist the links become invalid.
If the links are automatically archived then it can help the community can understand what it offered and perhaps even help understanding why it didn't succeed.
Of course link rot is not specific to needgap, Whole wide web is affected by the link rot.
You should look at link rot and NTFs! I can see that being a serious problem that would have some serious value if you can solve it and explain it to people properly