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Eh? "Use a prediction service" is about whether you send data as you type _to your default search engine_, not to Google. If you change to DuckDuckGo as your default search engine, toggling "use a prediction service" on and off will not send any more or less data to Google, because omnibox typing is never sent to Google in that case regardless.

Source: I am the former Chrome omnibox owner. You can find the relevant code for this starting at https://cs.chromium.org/chromium/src/components/omnibox/brow... ; look for how GetDefaultProviderURL() works and when that query is sent. You can also watch packets with your favorite network analyzer.

Was playing around with the omnibox debug tool (chrome://omnibox) the other day, pretty cool how it inter-ranks literal search, search suggests, history into one.

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