"Hashed emails". Besides the fact that they can match up a hash from one source to a hash from another source to link them to the same person (they never said they'd salt them), emails often have enough predictability to break the hash. Assuming they all end in "@gmail.com", "@outlook.com", or "@yahoo.com" will get you the vast majority of emails out there. Unlike a good password scheme, people don't shove a lot of random data into their email addresses.
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