Cloudflare is actively disabling access to some pirate site URLs on its network, informing visitors that the requested pages are unavailable for legal reasons. While these types of ‘HTTP 451’ error messages are relatively rare, they are nothing more than Cloudflare complying with its legal obligations under the DMCA.
Tell that to the 12345678x captchas and “unblock challenge” notices I get whenever I try to browse common sites on the internet!