Hackers use these files for Credential Stuffing . They use automated tools to "stuff" these 135,000 combinations into the login pages of other popular sites (like Netflix, Spotify, or banking portals) to see if people reused the same password [1, 2].
The "135k" indicates that this specific list contains approximately What is a Combo List? 135k Combo List.txt
It means those credentials are in the public domain. If you use that password anywhere else, those accounts are at high risk. Hackers use these files for Credential Stuffing