To me, this is just another way Big Tech is trying to siphon everything you do via them for inspection, ie. their marketing or selling of trending what you do regularly, including Apple. People don't know any better, it sounds real good to the normal layperson user as "protection", but really, it's not. When Apple switches this on globally under the guise of user benefit, I just laugh knowing better. Now that Apple sees _everything_ you do, they can go ahead and build that search engine they always wanted too.
Think differently said the wolf to the sheep.
Funny just a week or so ago Google of all people announced a "Privacy VPN" product. Hah, yeah right Google, you're just mad Apple thought of the racket first and want in on the action since Microsoft already has their Telemetry spyware well established for everything a user does sent to them, and Apple now too with their privacy proxy spyware.
Use a VPN and unbounded orso if you want to keep you queries private..
Good to know
* when setting up home networks or
* you want to use DNS for content filtering or
* you prefer your DNS queries to stay private
It Advance Tracking Protection™ an Apple thing or is it a broader more extensible standard?