The original user appears to have deleted their account.
Had they stayed, my response would have been that privacy is addressed in the FAQ. And as mentioned there, it is simple enough to sign up for an account with one or more of the OAUTH providers that gives the OAUTH provider no private information, so that the OAUTH provider cannot provide this Community Forum with any private information.
For future readers: changing the password does nothing, because there is no username/password login available. (The forum software will not allow us to hide that setting)