It's not a safe monopoly at all, though. Most of my "question"-style queries now go directly to an LLM-based alternative, on account of how much Google search results have dropped in quality for that type of query. I only really use Google directly for stuff like finding something that I specifically know what I'm looking for, but don't know the exact link to.
What search api do you think those services use under the hood? Funnily enough though, only Bing actually lets you use their API directly, services that build on top of Google are paying proxy scrapers because Google doesn't sell direct access to their search results. I'm guessing they'll open it up to capture that market eventually.