: These files are usually hosted on "leaks" forums or shady file-sharing sites. They are never distributed through official or safe channels.
: Using these credentials to attempt to log into accounts you do not own is illegal (unauthorized access) and violates privacy laws.
If you are a security researcher, only handle such data within a controlled, sandboxed environment. If you are a student or faculty member concerned about your data, check Have I Been Pwned to see if your university email has been compromised in a known breach.
: Most "combo lists" found for free online are "public" or "recycled," meaning the passwords are often outdated, already changed, or the accounts have been flagged and secured by the institutions.
: Downloading these files is highly dangerous. They are frequently used as "bait" to spread malware, info-stealers, or trojans to the person downloading them.