In my opinion, that is pure rubbish. There is value in information and there is nothing morally unacceptable with selling something of value. Even if the information is widely available out there, you can still provide value. Instead of somebody searching for 5 hours to learn how to train their dog to do push-ups, they can buy an ebook where all that information is written out in a centralized and organized fashion. They are willing to spend $20 to save the 5 hours of research time...nothing wrong with that to me
If you think about it, most professions (service and non-service) are based around freely available information.
Do you think info products are fundamentally unethical?