How do you bust popularity?
Google has out-performed other search engine offerings and earned people's preference.
I don't think there is any anti-trust case here. People can always take their searching elsewhere.
Can any less be said of Standard Oil or the Bell companies? But the thing is that Google does
not outperform other search engines, nowadays. In fact, they largely perform less capably than their own performance a decade ago, in terms of search results. And they certainly don't perform well for paying advertisers compared to the past, as they've merely become an expensive, extortive pseudo-tax.
What Google has done is successfully inserted themselves into many aspects of every day life. Which brings us back to my comment about conflicts of interest.