Re: A point?
You are correct - there is a valid question to be answered about if Google are monopolistic. Lots of people have taken up postions that assume one side or the other. Certainly, if it can be objectively found that Google (or anyone else) is acting monopolistically, then it doesn't matter who the complainants are.
My particular point of view is that Google are not monopolistic, just ver successful, and cannot be compared with Microsoft in the desktop OS market. Going to a different search engine requires nothing more than typing in a url or clicking a link. It is easy, and requires no expenditure of time, money, or training. Breaking away from Microsoft to go to one of the other OSes requires all of those, and therefore does create an effective monopoly for many users.
Any search engine wanting a new market can use traditional advertising (TV, radio, newspapers), and word of mouth - every time I hear about a new search engine, I try it out. That's how I became a Google user in the first place, and found it better than the search method I had been using before, which involved using a metasearch aggregator to simultaneously (and slowly) do what Google did quickly and efficiently.