Scrutinize the file extension. If it's a .txt.exe or contains hidden scripts, it's a virus.

Using these lists to access accounts you don't own is illegal under the CFAA (Computer Fraud and Abuse Act).

Claiming "100% valid" is a common marketing tactic; expect a 20-40% decay rate due to password changes or account bans.

Standard user:pass or email:pass combo list, optimized for automated checking tools.