Acuity Who? Attempts and Failures to Attribute 437GB of Breached Data

The author investigates a 437GB dataset (ACUITY_MASTER_18062020.csv) containing ~21.9M email addresses and extensive enrichment fields, discusses ambiguity over which of several companies named “Acuity” — or a data aggregator — is the source, and loads the list into Have I Been Pwned as a spam list while noting evidence of increased phishing and scams against people in the dataset.