The main reason we ask is for age verification, but we are actually required to collect your SSN if you are a United States Citizen. Per Nevada Regulation 5A.110.2.d we can only register you if you provide your Social Security Number.
Our Player Care team, our supervisors, Stations Casinos team members and supervisors do not have access to your SSN. Furthermore, it is encrypted in our database, so if anyone was to access our database; they wouldn't be able to read your SSN. We work very hard to ensure the security, privacy and integrity of your information.