Just like the article mentioned, he has become almost synonymous with fairy tales associated with stories for kids, but for anyone who has ever read from a collection of his stories, a majority of them are most certainly not appropriate for kids. Some of them are incredibly sad, and as another comment says, the fate of the characters often can change for the worse in the last paragraphs, when you least expect it.
I can only recommend reading his works, they are deeply profound.
https://mrshu.github.io/github-statuses/
Seems more accurate with my experience of GitHub.