I don't think it's that black and white. It's clear that they have enormous influence in the general population, and the amount of people who care about this kind of thing enough to switch to a different search engine are not enough to change that influence.

Remember Microsoft once had an antitrust brought against it for shipping IE with their OS. Imagine now, shipping a phone to millions, with your browser that defaults every text input to a search string directly into your ad network.