For the individuals included in this list, the risk is immediate. If the "150k steam.txt" file includes passwords, they are often hashed (encrypted). However, weak hashes can be cracked quickly, exposing user credentials. If the data is simply a list of usernames and emails, it becomes a goldmine for targeted phishing campaigns. A user might receive a forged email disguised as official Steam support, urging them to "verify their account" on a fraudulent website, thereby stealing their actual login credentials.
As seen with Steam Guard, even if a password is stolen, a second layer of security prevents unauthorized access. 150k steam.txt
of how such data is stolen or cracked.