Well, as you may be aware, banks like getting money.

Taking money from their customers through banking fees and interest on both deposits and loans isn’t enough for the banks and credit card issuers. So they sell credit card and loan usage information to whoever will pay for it, and these credit monitoring companies will, to keep a file on you (tied to your SSN/SIN). They know how many loan accounts and how long you’ve had them for, how often you pay your loan bill on time vs. not, what % of your credit limit you tend to use each month, and when you go shopping for new loans (since loan agencies will request your file from them to determine whether you are trustworthy enough).