[RavlaAlvar]

I agree with your assessment that maybe this is an inevitable outcome of one big dominant search engine.

But I would argue one big search engine is unavoidable since no one would want to use the second best search engine.

Google search didn’t come the best because the other service like mail map and YouTube. So breaking up Google does nothing to stop google search from being the monopoly it is today.

[stvltvs]

If different search engines optimized for different niches, there would be an user base for "second best" search engines. For example, nothing beats Bing for porn search.