DoH-IP-blocklists VS libcurl

Here’s one of the public ones we use: https://github.com/dibdot/DoH-IP-blocklists

While you can in turn block those DoH servers (and probably block port 853 too to stop the default DoT & DoQ traffic), there are ridiculous amount of public DoH servers available, partly because of how easy it is to self-host AGH and expose the DoH endpoint to the public. Anyone can even create their own in minutes.

Then, in another terminal window, we use curl to hit the endpoint:

Made a PR to curl in line with the above: https://github.com/curl/curl/pull/13338

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From the GitHub Issue itself, the maintainer did end up creating a PR to fix a related issue: https://github.com/curl/curl/issues/12983

Also, the bot filed another issue despite the complaints.

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