Bank details

Yes details are on cheques, but with scammers the next step would be to somehow prise your PIN/password from you, so the least they know the better.

Once you've taken the initial bait the criminals are halfway there.

I'm not sure what use the bank account and sort code are on their own. You give that to people when you want them to transfer money to your account. But you can't take money out without some kind of authorisation, usually a text to your mobile phone. If the scammers have found a way to by-pass that then we are all at risk because we do give out bank account details and sort code quite often.

When you buy online you give your card details and even the 3 digit number on the back!

Of course they are!

My bank card was hacked online and I didn't notice it till statement came in....I now use Internet banking and only card I use online is my credit card as... My bank paid me back the money that was spent on my card...It was used on amazon....