If that includes user data (such as emails, phone #s, social media accounts, etc.) that's bad news for all of us who have or had accounts with them.
Why would reddit have your phone #s, social media accounts, etc?
They're sign up options. You can sign up with Facebook, email and/or phone # iirc.
I'm not nearly techy enough to discuss this in detail, but I thought that reddit itself doesn't really see that data (google password), thought it was an API that validated the log in. I'd be very happy to be corrected if wrong, however.