Not an use-case I have currently for myself, but I thought that wikis and other services that host content written by third-parties would be better if they checked broken-links and notified visitors and content creators.
Maybe my use-case is limiting my ability to think about someone paying for it.
How certain startups CMS based content could go checking broken-links?
1. They implement their own checker - fair enough, if they want to do it.
2. They use a micro API for it and forget about investing the time on it, if it works well for them.
What is the use case that made you to believe this is useful?
Thanks for the feedback!