Why would he do this? What is the purpose of having all those documents?
He is the author of numerous articles on a variety of topics, especially the corrupting influence of big money on institutions including nonprofits, the media, politics, and public opinion. In conjunction with Shireen Barday, he downloaded and analyzed 441,170 law review articles to determine the source of their funding; the results were published in the Stanford Law Review. From 2010-11, he researched these topics as a Fellow at the Harvard Ethics Center Lab on Institutional Corruption.
He has also assisted many other researchers in collecting and analyzing large data sets with theinfo.org. His landmark analysis of Wikipedia, Who Writes Wikipedia?, has been widely cited.