If you are concerned about your own data being in a list like this:
Use a reputable service like Have I Been Pwned to see if your email address has appeared in any known data breaches. 3.4 Million HQ Combolist.txt
Generate unique, complex passwords for every account so that one leak doesn't compromise your entire digital life. If you are concerned about your own data
Hackers use automated tools to test these millions of logins across popular sites like Netflix, Amazon, or banking portals, banking on the fact that people reuse passwords. or banking portals
If you find a site hosting these files, you can report it to:
Run by the FBI for reporting online scams and breaches. Google Safe Browsing : To report malicious websites.