Maybe it’s whatever archive.to and similar sites do that Cloudflare hates? Using a 8.8.8.8 as a secondary DNS fixes it.
What do you mean? archive.is blocks DNS requests from Cloudflare servers because they don't include the end user's IP range in the request using an optional DNS extension. They do answer such DNS requests coming from others.
https://mobile.twitter.com/archiveis/status/1018691421182791...