Citation needed. I don't believe that for one moment. Already people are producing far more content for free each second than one person could ever consume in a lifetime on sites like Youtube and Instagram. The urge is there, even without any monetary reward.
> Consider how much better the world has become due to easy access to information.
Now consider how much worse the world has become due to the incentive to hide wanted information behind commercial information. Simple example: there was a time before adblockers when it was not a rare sight to have a page with 80% advertising and 20% actual content. Think unskippable ads before videos. Think of the mountains of useless content that SEO spam produces that hide the interesting pages in search engines.
Marketing does not give access to information. On the contrary, it takes it away.