One of the software design principles is critical data segregation. By storing customer personal data in the Databunker, you basically minimize the attack outcome from your existing database, thus minimizing the business risk factors.
Suppose, the bad actor finds an SQL injection in your web app. The attacker might get access to the database. The attacker will not be able to get access to your customer’s personal data as this information is stored outside of your existing database (in Databunker).
In addition to storing user profiles, you can use Databunker can store additional user information separately from the personal profile. For example, you can store shipping information separately from a user profile. You have an API to retrieve this extra data without returning user personal records (name, email, phone, etc…).