available on archive here: https://archive.is/pk9YR
I should reiterate: this is archive.is' doing this, not Cloudflare.
EDIT: Some more details, including quotes from Cloudflare's CEO from another internet citizen: https://jarv.is/notes/cloudflare-dns-archive-is-blocked/
EDIT2: I should mention that I still use 1.1.1.1, and I agree with their stance on this. :)
Archive.is a free service and goes offline frequently so I'm inclined to believe he's really trying to triage the problem queue, unless I'm missing something.