Don't ask me how I know, don't believe me, but its Wells Fargo.
> It's unclear to me what segment of bank customers would knowingly agree to anything remotely close to this.
Customers would not agree much, correct. However since credit cards are not your money, you are limited in the ways to tell the bank how and what to share or not to share with other players on the market, since its bank's money you operated with, and bank's goal is to make as much money off of lending it to you as possible. (of course I don't like; jsut so you know before you downvote)
This is in fact even right in your face. Any new card (or renewal you got in mail) has a few pages attached to it, called something like "what do we do with your information and how can you stop us", where it clearly draws a matrix table with YES/NO of what information they share, with whom, and in which example you can change their default behavior (hint: not always)