If one site is breached, attackers will use those credentials to try and get into your other accounts (like PSN, email, or banking).
Use tools like Have I Been Pwned to see if your email address has been part of a known breach. To help you better understand the risk, How to check if your email has been compromised? Steps to take if you suspect your account was breached? Download File 1.5K PSN Combo [Learntocrack.com]...
It started as a tempting link on a forum—"1.5K PSN Combo [Learntocrack.com]". Promising a free list of PlayStation Network accounts, it was a honey pot for users looking for "free" content. If one site is breached, attackers will use
This is the most effective protection . Even if someone has your username and password, they cannot log in without the code sent to your phone. Steps to take if you suspect your account was breached