Google search has some features that alternative search engines don’t. I use DuckDuckGo for 99% of everything, but I occasionally use Google to see local busy hours, or sometimes any hours, reviews, phone numbers without navigating a shitty website, etc.
I think there are ways to break up Google search on its own, and make some of those features separate and accessible on other search engines.
Then there’s the matter of advertising, data collection, SEO, exclusivity with corporations like Reddit, etc.
Google is doing things with its search that seem to intentionally reduce the ability of other search engines to compete with them, and that’s really all that the antitrust laws are meant to prevent.