Such lists are primarily used by threat actors for:
Ensure you are not reusing the same password across multiple platforms, especially your primary email. 280K VALID MAIL ACCESS.rar
Use legitimate services to see if your email has appeared in known public breaches. Such lists are primarily used by threat actors
Testing these "valid" credentials against other services (like Netflix, Amazon, or banking portals) where users might reuse the same password. Security Implications 280K VALID MAIL ACCESS.rar