All of your personal data we receive from your authentication provider is to guarantee you are a real person, to have a better experience and to notify you about pending games. We don't deal with third parties for your info.
When you choose your authentication method it's assumed you know their privacy and retention policies.
When a user asks to be removed from Bodogemu, all information received from the external provider is erased. The info about games played is anonymised to guarantee consistency with all other players.