@Edent your Fediverse post/preview here says
> [..] self-attest using Domain Verification0.

Curious if that was something specific like ACME's DNS-01 challenge I've clicked and read your blog, but the "0" is just a numbered footnote 😅

Another non-technical issue with domain validation is that it's easy to get wrong as a human, as you've said, and that e.g. Google is trying to remove URLs from their browser UI, so it is even less accessible to laymen for manual inspection. Search engine as DNS.