You’re making a large number of unrealistic assumptions. The biggest one is that working addresses are evenly distributed. They aren’t. Names and words are far more common than random strings. The second bad assumption is that the search needs to be complete to be damaging. If you can anonymize the first billion or two emails you have a named dataset of unbelievable richness and detail. The third is still the option to work from known emails to marketing databases. If you take one person’s hashed email it is a simple database query to get their information.
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