On the charge of just wanting to break up big companies because they're big, I plead not guilty on the virtue of this not being a crime. The whole point of breaking up large companies is because their size renders them unaccountable quazi-governments. To properly regulate them requires making the government
even bigger with ever-more-complicated regulatory apparatus, compliance departments, administrative rulemaking, and "special understandings" (read: giving up) for the largest players.
I'll put it to you another way: if you want smaller government, you need smaller corporations, too.
> There was no alternative to Google search because no one had built a better product for reasons that have nothing to do with anticompetitive behavior.
I would first argue that Google's unparalleled superiority in search is overblown. For one, there's ads in it. As Google's founders themselves stated, ads are a perverse incentive to ruin the search experience in favor of advertisers and I can point to several examples[0] in which this happened.
There are paid search engines that do not have advertising (e.g. Kagi) but they themselves have complained about the struggle that is competing with Google. For example, on iOS, there's only five default search engine options, there's no way to add a different search engine as default, and Google pays $$$ to Apple to be set to the default and for that search engine option to be buried in Settings. I don't see how that isn't anticompetitive.
On a technical level, Google has a supracompetitive advantage, too. A lot of websites have restrictive policies that forbid scraping except for Google and Bing. This means only those search engines can actually return results for those sites.
[0] Product ads in web search, every programming search query giving you four or five ads before the actual StackOverflow answer you're interested in, image search becoming a glorified product search with actual functionality being removed, Gemini