Came here to say roughly the same thing. That it’s Google and they’re not charging you for it can at this point be considered suspicious, if not conclusive.
Google stated that for the purposes of performance and security, the querying IP address will be deleted after 24–48 hours, but Internet service provider (ISP) and location information are stored permanently on their servers.
> Google does not use any personal information collected through the Public DNS service to target ads.
> We do not correlate or associate personal information in Google Public DNS logs with your information from use of any other Google service except for addressing security and abuse.
Yes they claim that they don’t use the personal information they collect to target ads.
It doesn’t mean they don’t use the other data for analytics. They could also anonymise the personal information first before using it to do analytics. Like “users who visit example.com also visit “store.example.net” is good information and they don’t need your personal information for that.
Why do they collect personal information? Why do they collect dns logs ?
At this point, the onus is to prove thing $x is not used for Google analytics.