The library is a catalog of books produced by publishers for the sake of making money. Your example doesn't hold weight, as there is no "purity of information". Even your own insights are filtered through the perspective of your personal influence, your wants, your desires, your history, etc.

Google is no different. The organic search results are largely from commercial, or at a minimum, self-interested sources.

That doesn't make it wrong. There's huge value there. Just the same, money is not evil. It's a mechanism for storing value. It's imperfect, and abused, and certainly not the only measurement of value. Keeping those value systems in balance is the key.