The heart of man is evil, reason why you should keep most things secret especially where it concerns finance. People can get jealous and want to attack you or snitch you to the corrupt security agencies looking for who to devour.
On the Internet identity, it's not too good to expose ur identity but if you don't use ur original details for KYC to register to an exchange that makes the person a scammer coz why will you hide your identity since it's been gathered for security purposes