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Notably they return invalid results for queries without EDNS information from only Cloudflare.

Is Cloudflare's implementation somehow different, or is it an explicit blacklist of some kind?

They blacklist Cloudflare for petty reasons

Alternatively, nextdns.io can anonymise the EDNS client subnet so you can browse sites like archive.is without giving out a real ip address.

Perhaps cloudflare could do something similar.

It seems silly to give out fake information to work around a stubborn site with a vendetta. I think it makes sense to provide a distinction between no information and information instead of providing incorrect information.

Can’t they just send phony information that indicates the region the resolver is in?