The value of a blog is the writing. They don't really depend on the one photo they use. The "value" of the website in question is that they get to laugh at photos that you can't use commercially. Without the photos, the website is nothing. A legal battle around this question probably depends largely on the lawyers arguing about where the value of the commercial entity derives from.

To get a real answer you'd have to ask a lawyer. But my intuition is a blog that uses one photo per post in fine, while the website in question is not fine because it requires the photos to even exist as a website.