I have a CVS card. I purposely misspelled my name and gave as little information as possible to protect my privacy. I've done likewise on other store cards, though I avoid them if possible.
The discounts aren't as good as claimed. You do get a lot of coupons when you make a purchase, but the terms of the coupons are so restrictive -- products you don't want, minimum purchase, or too short a time frame, that in most cases they have no value. I guess it saves me about $10-$20 a year.
Does ANYONE out there care about privacy? Back when I started privacy of client/customer accounts was paramount. Not because the law said so (though it did), but because it was the right thing to do.
In a large computer center, one couldn't just go into data files without authorization. Files that left the building were controlled.
Who the heck are the turkeys designing the open systems of today?