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.
It's not the most intuitive thing in the world and I think that's case the key analogy throws people. I think its more like a translator, your recipient's public key lets you send him messages in his own secret language.→