Fun fact: the reason recipe books and blogs share these anecdotes is because you cannot copyright a recipe.
Hi, web dev here -
The other guys correct. For big sites and most smaller ones, it’s because they can squeeze in SEO keywords and ad spots into their BS stories. Some smaller ones might do it cause “everyone else does it”, but the vast majority is just trying to improve recipe rankings, to the point that older recipes I’ve had bookmarked have had stories added to them years after upload.