if the 1% figure wasn't enough to tell you it's flawed, how about their source being search engines that automatically filter most of it
search engines deliberately leave it long periods before they start indexing sites, it is normally 2-3 months before a site is allowed in to the indexes, so they have instantly excluded porn sites that are set up, spammed out to thousands of people by email, then closed after a few months - which is a substantial number
then there is the method of sampling the index for pages, a porn site they might get say 4 pages they can access (home page, some terms and conditions page, a preview page and a join page for example) as the vast majority of it is members only - whereas this site alone has over 22,000 URLs in the google database, so if they had just this site and 5,500 porn sites - they would be telling you from their sample that 50% of the sample was winmxworld and 50% was porn... when really only 1 site out of the 5501 sites (less than 0.02%) was winmxworld
seriously, everyone knows
the internet is for porn