Why did british couple sue Google?

Adam and Shivan Rauff, a British couple who took Google giant to the court for abusing its market dominance and by favoring its own services and manipulating search results for its own profits. Adam and Shivan Rauff, quit their jobs in 2005 and started a price comparing website named, Foundem. And after a few months they noticed that they were being downgraded and penalized by google for different searches by users. After years of complaining the couple decided to take Google to court and sue them for£2.1 billion. On, June 27, 2017, Margaret Vestager, the European Commissioner adjudged that the giant Google has used its market dominance unfairly and ordered them to pay the fine to the couple.