That's known as "tying" - an illegal use of a overwhelming market position to leverage the market position of other products of the same company. That's the key thing that determines illegal monopolistic practice.
That's true if you define Google as a link search engine, but what if you were to define it as a "solution finder"? This way it just fits into the definition.
I don't understand how the presence of information on a website constitutes tying. What the hell happened to free speech?