Realistically Google Search and Google Maps don’t provide anything unique that isn’t provided by competitors, although a) they may provide a superior experience, and b) the competitors are not necessarily much more palatable (that is, Bing Search and Bing Maps are hardly a great ethical improvement).
YouTube is probably the only Google service where this is a genuine monopoly of sorts. That is, content that is on YouTube is not generally available on other platforms, and if you want to watch that content you have to watch it on YouTube. We might all live for the day when all content creators are dual-hosting in PeerTube or the like too, but we’re a long long way from that right now.
Although I write that as someone who only very rarely actually uses YouTube, because largely the content isn’t to my interest. Other than my local football club’s channel, I can’t think of anything on there that I actually seek out.