The primary danger is that a password leaked from one service might work on another (e.g., banking or social media) if the user reuses credentials.
Automated software systematically tests these leaked pairs against various websites to find matches. Recommended actions
Attackers use these lists to gain unauthorized access to personal or corporate email accounts.
Files like these are often distributed or sold on dark web forums and Telegram channels.
These are standard plain-text files designed to be fed into automated tools for credential stuffing . Security risks and implications