Apparently the porn industry is going after github pages (by sending DMCA to google), you can read the story here (found there).
Using https://www.chillingeffects.org/notices/search?page=1&sort_by=&term=github.com (https://github.com/berkmancenter/chillingeffects/blob/master/doc/api_documentation.mkd#example-successful-response-2) (and an horribly quick and dirty script), here is the list all the concerned users and repositories page (you can find the data bellow):