Seriously, once your data is out there, do you really have that much control over it? NO! The company(ies) can tell you their stance is no sharing/selling of data etc., but again we have no control. Well, except to not load our data on a particular website.
However, when it comes to banks, credit cards and the likes, I EXPECT properly security and privacy. Then again, I feel the respective company has more to lose. Yes, I could be inconvenienced, but...