Google does not have a monopoly on search. Bing / DuckDuckGo works just fine.
Around 82% of search engine requests are issued through Google. Bing around 10%. I don’t know if we just have differing definitions of “monopoly,” but Google is the default on all Android devices, almost every non-Microsoft browser, and probably on Apple products as well. And most users don’t know enough or care enough to ever change from that.
Given that Amazon, Microsoft, and Google together only account for 64% of global cloud hosting, I’m going to say those numbers don’t add up. But you are right that Google is third behind the other two.