Google DNS cartoon
This comic imagines Google focusing on its 8.8.8.8 public resolver, a cultural snapshot of how visible public DNS became.

This comic imagines Google shutting down its other products so it can focus on the 8.8.8.8 public DNS server.
It is not a separate DNS protocol or service. It belongs in the talk as a small cultural artefact about the visibility of public resolvers.
Google even acknowledges this!
$ dig +short TXT dns.google
"https://xkcd.com/1361/"
"v=spf1 -all"