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.
You could argue gold was the 1st decentralised currency in being that even today it stands as currency. technically paper money and bank accounts are just a reflection of how much gold and silver a person has→