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> Be it ordering some product online or booking a flight or other travel ticket or ordering a service

That's true, but all these places already track the living hell out of you. Even the newsletters they send over email have tracking information. By the time they've sent you an email after your first purchase, they know everything they need to show you relevant ads (in fact, that's probably why you made the first purchase...). I doubt bulk analysis of emails can show anything that is not already known way before the emails got sent.

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