Yes anybody could use Bing, but they won't. That leads to big revenues for Google. Question now is, what Google does with those revenues. Do they invest in other markets where they otherwise can't compete to drive competitors out of the market? - Then they abuse the power they got.
That is clearly not an abuse of power, unless we have to adopt the ideology that anything a big company does with their profit is an abuse of power. Would you be happier if all profit went to shareholders and none to investing?
