Exploiting vulnerabilities in website databases to export user tables.
If you are concerned your data might be in a list like this, take these steps immediately:
The phrase "Private Duplicate Removed" is a marketing tactic used by data brokers to suggest the list is unique, high-quality, and hasn't been "burnt" (detected and blocked) by security systems yet. How These Lists Are Created
Enter your email to see if it appears in known public breaches.