Edit: found it, cloudflare truncates edns, which is why archive sandbags requests that are boot strapped with a cloudflare dns lookup:
It is absolutely hitting more the Cloudflare users.
It's not that old edns issue (tho might it be tangentially related).
P.S got a typo there? the -> than?
tl;dr It's not (just) Cloudflare. Lots of (all?) DNS providers are giving out IP addresses that send users to unskippable captcha pages. The DNS providers get those IPs from Archive's own NS. So Archive is the real source.
It depends on where you are in the world. I get Captcha IPs from Quad9 (9.9.9.9) if I query from FL,US - and good IPs if I query Quad9 from Romania.
As of today, these IPs are good:
5.188.6.118
23.184.48.154
94.140.114.194
178.17.174.208
179.43.151.41
domains: archive.today
archive.ph
archive.is
archive.li
archive.vn
archive.fo
archive.md
No promises about tomorrow or even an hour from now.