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.
These pics from my coinbase send to wallet page,have circled the arrows icon to change to BTC,hope this helps. Managed to comment on the right post this time too! Lol→