Earlier quoted context omitted.
The reason Google is because of their AI. And the reason their AI is good is because of the massive amount of data they collect by violating privacy. No other company can start right now. Their search engine is years of efforts of collecting every user's data in Chrome for determining 'freshness', page rank and other related stuff.
You are making the same flawed argument that the DOJ complaint is making: that Microsoft, Apple, Facebook, and Amazon, some of the largest companies Earth has ever seen, somehow can't afford to compete in search, which is plainly ridiculous.
The problem arises when a company leverages a monopoly to suppress competition, implement predatory pricing, or manipulate competition in another market. Using a monopoly in search to compel tying agreements prohibiting browsers or manufacturers from including other search engines or apps would qualify. If it turns out that agents of the company (Directors, VPs, etc) internally communicated an intent to suppress competition that would be more than enough to bury them.