That's ridiculous. The card number has nothing to do with the account number.
Sometimes it does, sometimes it doesn't. My debit card from my credit union is easy to map to the account as they share digits, but other debit cards from other institutions are completely unrelated.
alt Hacker News
Sometimes it does, sometimes it doesn't. My debit card from my credit union is easy to map to the account as they share digits, but other debit cards from other institutions are completely unrelated.