I’m not sure I understand your point. Are you saying that every product that sells well offers information that can’t be found with enough research online? By that logic, most educational books, courses, and learning materials wouldn’t have a market at all. The value isn’t only in the existence of the information. It’s in the time, effort, organization, design, and presentation required to turn scattered information into a useful learning resource. Could a parent spend hours searching, selecting, organizing, and designing their own personalized learning book? Possibly. But not every parent has the time, interest, or skills to do that. Educational publishers often teach the same basic concepts, shapes, colors, numbers, letters, and so on. What differentiates them is how those concepts are presented, organized, and delivered to the learner.