WeLeakInfo was a website that offered paid subscriptions for searchable access to a database containing 12.5 billion user records stolen during data breaches. This data included email addresses, names, phone numbers, addresses, and in many cases, passwords. Threat actors commonly used the site to conduct phishing campaigns, credential stuffing attacks, and potentially gain access to corporate networks. In January 2020, an international law enforcement operation including the FBI, UK NCA, the Netherlands National Police Corps, the German Bundeskriminalamt, and the Police Service of Northern Ireland, allowed the FBI to seize the site’s domain.
Source: https://www.bleepingcomputer.com/news/security/hacker-leaks-payment-data-from-defunct-weleakinfo-breach-site/