we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
The email alerts are sent to registeted users, they basically say "login to littlebiggy for a mesaage", they don't say anything about your order or even mention your username. There really is no value in not registering.→