Breached helps the user by letting them know if there is any compromised data available on the web related to their email id and let them act early by changing their passwords.
When a data breach happens on the company, hackers steal the companys users information is which might contain confidential data like passwords and sometimes this data might be available on the web sometime after the breach.
Most of the users might not be aware that if any data breach happens, which sensitive information is available on the web related to their email id.