I don't know this, but I'd expect that there is some form of revenue to United for spend on their co-branded cards while spend on the CSR, there wouldn't be any kickback for that. I'd be willing to bet that CC spend on the United co-brand cards is down, maybe a lot, since the CSR release, since if you hold both, there's no reason to spend on your United card when you earn more points on the CSR (unless it's a United flight and you need the checked bag waiver, or you're spending to meet the PQD waiver). Also with the United card being 5/24 restricted that must be limiting new sign ups at least a bit.