Data mining, at one time, was deemed as an invasion of privacy. These days it’s an acceptable method to making your web experience tailored to fit your desires. Spotify is not directly selling services to their consumers by data mining but creating content from the data to grab the attention of their target audience.
Many places run a blog only because it boosts their SEO (the ranking they have when someone uses Google’s search engine). Google has built an evolving algorithm that requires websites to keep their sites genuine and fresh. Google’s increasing standards are aimed at what we all want, a better internet.