Consumers are presented with a much larger amount of content online than ever before, because there is a persistent demand for new content as search engines like Google often favour newer content. This is enhanced by world-wide competition as opposed to the pre-online situation with more local competition. All of this places a strain on journalism.
As publishers rally to make top ranks in search engine result pages, the basic information or quality of the articles tends to be of lesser importance. In other words: Search engines favor the sheer mass of similar articles, jugding by it that a topic related to a search phrase is of importance. Often, this is the case.