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.
Same happened to my brother, he was trying to add funds for days but every time it would bounce back. He closed the account created a new one and in 10min he was good to go. We still don't know what was the issue→