The new title seems more descriptive to me. How many people know what a pihole is, but not DNS? I understand DNS a lot better than pihole, which I've barely heard of.
> I understand DNS a lot better than pihole
Unless the mods did a survey this doesn't justify the title change. It's just as likely that more people are familiar with pihole than DNS, and if the mods don't know (which they don't) then they should leave the title as the author wrote it.