3.67% of the most popular websites block Tor (because of Akamai and CloudFlare)

The open-access version of the full paper has been made available by the Internet Society: <a href="https:&#x2F;&#x2F;www.internetsociety.org&#x2F;sites&#x2F;default&#x2F;files&#x2F;blogs-media&#x2F;do-you-see-what-i-see-differential-treatment-anonymous-users.pdf" rel="nofollow">https:&#x2F;&#x2F;www.internetsociety.org&#x2F;sites&#x2F;default&#x2F;files&#x2F;blogs-me...</a>

Many of the listed sites almost certainly block Tor to prevent large scale scraping.