Google says Search Services History may include your searches, results you view, AI Mode responses, voice search recordings, Search Live transcripts, Google Lens images, uploaded files and some information tied to your activity..
turning off Save Media does not automatically wipe everything that was already saved .. deleting the original activity may not pull it back.
I use Bing search, google search almost never. Googs major hook into my data is you tube.
I also do AI searches via Grok and chatGPT. Never via goog Gemini AI.