Nothing malicious here, I just stumbled on bad code (similar to the wrong example) in the wild in my spare time
and wanted to showcase/POC the problem in a tongue-in-cheek real-world example with this page

If that's a problem you can reach out to me -- Andreas Loibl (who/aloibl) <mail@aloibl.de>

I'm (obviously) not a bot

Please ensure that the implementation of your verification is done in a correct way.

Naively trusting rDNS is definitely wrong.