Thanks to Zsolt Benke for sharing this post from Objective Development Blog:
macOS Sequoia introduces another new feature labelled Help Apple Improve Search, which sends and stores various search queries from Safari, Spotlight, and other sources to improve search results.
This feature, too, is enabled by default and is well hidden at the very bottom of System Settings > Spotlight.
It turns out that I had disabled this setting on my iPhone, and iPad but not on my Mac so I disabled it.
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