I've seen a lot of news about Google modifying its search results to Google's advantage and how it's illegal. Why can't Google modify it? The results were public data gathered by Google, Google should have the right to choose which sites to display on it.
For example, Google can't simply remove all of its competitors from its search results, right? But why?

I just came across this line: "If Google is found guilty of abusing its dominant position in the search or advertising markets it could face a hefty fine." here: http://www.bbc.co.uk/news/technology-12540731
But I still don't understand why