Data breaches are costly for businesses that expterience them, this data fuel the black markets and sometime are offered to complanies as legitimate data. After data breaches occur, some of the affected companies discover their data being sold online and buy it back. Most black market transactions happen on the open webs possible to access the respective sites via browsers like Firefox and Chrome without downloading special software first. The kind of information advertised on the open web should be enough to raise eyebrows by itself.”]
Source: https://securityaffairs.co/wordpress/75039/data-breach/data-breaches-unethical-data.html