> There are also high barriers to entry in these markets, in part because of network effects: the more consumers use a search engine, the more attractive it becomes to advertisers. The profits generated can then be used to attract even more consumers. Similarly, the data a search engine gathers about consumers can in turn be used to improve results.
Simply put, the EC believes that Google is a barrier to any viable competition, so there's no ability to develop a competitive service to Google's own.