Cloudflare does support IPv6 (has since 2012), but requires that you actually set up the AAAA record. Unfortunately many sites can't be bothered to do that desp

Cloudflare does support IPv6 (has since 2012), but requires that you actually set up the AAAA record. Unfortunately many sites can't be bothered to do that despite it being a 5-minute job, since not doing it doesn't currently break anything in most cases, and might break things for the minority with broken IPv6 configuration. Cloudfront now supports IPv6, so the reasoning for not enabling it on Amazon.com is likely similar.