Is there a reason that these social security numbers are persisted? I can understand the need to do a credit check for a new customer but after? The only use ca

Is there a reason that these social security numbers are persisted? I can understand the need to do a credit check for a new customer but after? The only use case I can possibly come up with is for customers looking to add additional lines to the account than what was originally approved for and thus needing a credit check re-run. But at that point it would be a more secure process to just ask customers for them again.