You’re probably confusing archive.org (The Internet Archive non-profit organization), which works with cloudflare dns, with archive.is (alternate domain for archive.today website snapshot service, commonly used to bypass paywalled articles), which don’t work on cloudflare but it’s due to its owner’s decision, not cloudflare’s fault. The gist is archive.is uses dns-based load balancer and CDN, which requires EDNS Client Subnet to determine the closest servers to serve the request. But Cloudflare disable EDNS Client Subnet on ther DNS service for privacy reason which seems to piss archive.is owner so much they blocked cloudflare dns.
You’re probably confusing archive.org (The Internet Archive non-profit organization), which works with cloudflare dns, with archive.is (alternate domain for archive.today website snapshot service, commonly used to bypass paywalled articles), which don’t work on cloudflare but it’s due to its owner’s decision, not cloudflare’s fault. The gist is archive.is uses dns-based load balancer and CDN, which requires EDNS Client Subnet to determine the closest servers to serve the request. But Cloudflare disable EDNS Client Subnet on ther DNS service for privacy reason which seems to piss archive.is owner so much they blocked cloudflare dns.