Some websites have the brilliant way of displaying articles or images in an infinite way. Which means when you scroll to the bottom, the page automatically loads the next set of articles.
At the moment when you are on the bottom, you see footer for a flash, but you won't be able to click anywhere, because the next set of articles is loaded already.
So why put a footer there in the first place? It's just annoying.
Dev.to is one of these examples, go to the homepage and experience it yourself.