Due to the changing nature of the web I'd even say that the sum total of useful information is actually decreasing year over year. I believe we hit an inflection point a decade or more ago when the number of people with specialized knowledge and skills who were publishing information about their domain online was surpassed by the new "content creators" whose primary goal was to optimize for clicks and ad revenue. This is unevenly applied across different areas of knowledge, the amount of information about computer and media related topics has increased but other areas seem to have realized a sharp decrease. I don't have any hard numbers to support this, only the feeling of it becoming increasingly difficult to find expert information in many areas. More and more I have to resort to public domain books as the only substantive source. There's just a general sense of something deeply wrong with the current state of the web.