No doubt you have come across some very informative articles online, and while many of them might have been from sources that were not credible, no doubt you found many that did answer questions you had and were from credible sources. Information is power, and in this case it can mean money.
Why do you think companies provide free information or will offer resources about topics in their field? It’s the same reason why we have infomercials or why drug companies fund research or car and petroleum companies fund energy research projects. They know that if the research should prove successful, it could mean big bucks for them.