Even banks don’t want to see everything you’ve purchased. That opens them up to a whole new avenue of subpoenas from police trying to prove crimes. They already have entire legal compliance departments dedicated to fulfilling subpoenas for financial crimes. They don’t want even more responsibility.
They know where I spent how much money; probably wouldn't take much to figure out what I could have bought in a situation like that where every individual product is slightly cheaper or more expensive than the last.