A threat actor is flooding a hacker forum with databases exposing expose over 386 million user records that they claim were stolen from eighteen companies during data breaches. Since July 21st, a seller of data breaches known as ShinyHunters has begun leaking the databases for free. The databases were stolen in data breaches first, with prices ranging between $500 (Zoosk) to $100,000 (Wattpad) Once they are no longer profitable, threat actors commonly release them on hacker forums to increase their community reputation.
Source: https://www.bleepingcomputer.com/news/security/hacker-leaks-386-million-user-records-from-18-companies-for-free/