The technical reasons behind it are that the archive.today guy wants any takedown notices to be cross-border, so he wants to know what country you are in so he can redirect you to a server outside it.
Cloudflare doesn't support a DNS extension that allows this (eDNS maybe?) and so it fails.
Re:Shinzo Abe's Assassination
by WarOnPrivacy on Monday November 06, 2023 @01:55PM
(#38167021)
Captcha pages are being served at IPs that don't come from CloudFlare. ex: Users who exclusively resolve thru Quad9 are getting Captcha pages.
Any inference that the Captcha issue is limited to CloudFlare users is incorrect.
Getting Captcha'd happens with non-cloudflare resolvers as well, tho not universally nor consistently.
I forced all of Archive domains to query against Quad9 and started getting unskipable Captchas months ago - when I was local(US).
When I placeshifted to overseas, Quad9 resolved to different IPs and those were usable.