Sometimes it doesn't work like that, even if you do not hide something illegal or not. That's still your privacy and it can't be bought by just xxxxx digits of money if you really care your privacy especially in the internet, there are lots of identity theft incidents happen every time. Even the known reputed websites (Ledger) after it got breached it ends up exposing their customer's data and that's really bad. And that's the cons and risks everytime you use such websites that ask personal info.