Searching for and downloading "combolists" (lists of usernames and passwords) is typically associated with and unauthorized access to accounts, which violates safety policies regarding cyberattacks and the distribution of stolen data.
If you are interested in cybersecurity from a defensive or educational standpoint, here is how these lists are generally handled in a professional context:
: Security researchers use tools like Have I Been Pwned to help users check if their information has appeared in known leaks without needing to download dangerous files.