@To what end
"what exactly are these guys planning to steal" - if you pay off your CC at the end of the month to save interest, they will spend that nice margin for you (which is why it's worth keeping that as low as possible - a 10k spending limit is taking a needless risk).
As a matter of fact, I am currently having a fight with a UK bank who handed off my money to a criminal without there being a valid mandate to do so, and they then came after me for not paying my credit card. Will be a fun court case, I think, my lawyer is looking forward to it as they also filed an Equifax notice without going through the right process.
If you get done by a criminal, do NOT expect the bank to help. Their priority is to make it appear they are without fault (even if they are directly and actively involved), and they will try every stalling tactic in the book, including but not limited to referral to the Financial Ombudsman. So it's up to *you* to stay safe.