Would you also not care if that dataset gets leaked to the internet some day?

If your bank leaks data, you would be in so much trouble that thinking about privacy implications of that would be pretty low on your list.

That's just your bank. If a global payment processor like Visa would leak data, there probably would be ripples going through most financial system (i.e. whole countries abandoning it, etc).

This makes zero sense. The biggest trouble is with the data/privacy, the funds would be safe. And no, the world wouldn't stop because of it, pretty much the opposite, small/medium scale leaks happen quite often and big ones aren't unheard of: https://m.startribune.com/target-settles-visa-card-issuer-cl...

How would the bank leaking data cause trouble?

Your entire digital life could be stolen from you if someone knows your name, address, DOB, and last 4 digits on your card. Attacker can go through e.g. the Gmail password recovery process very convincingly impersonating you.

Gmail will let someone who has that information take over your email account?

The name+address+DOB of many people are public. So anybody who gets a glimpse at someones "card" (I guess you mean credit card?) would be able to take over their gmail? That would surprise me.

Do you have a link that confirms this?

And how is that information not part of the data leak which wouldn't exists if one stop using Visa?

So keeping all payments in one places makes you less safe? Doesn't spreading out purchases between banks, credit cards and payment systems make it more likely? If I were that worried I'd pick on system that seemed to have the best track record and stick with it, which would probably be all Apple with things drawn on a mid sized bank chain with a good reputation. How does single sourcing not improve security?

My credit card purchases? Not really. I'm more worried about some of my teenage Reddit posts being tied to me than what brand of soap I buy on Amazon.

I wouldn't be happy about it. But as others have mentioned this specific data is way less sensitive for me than my email, actual bank data, photos and much much more. The quality of life vs risk ratio is heavily skewed towards electronic payments in my case.

The data isn't very granular. $218.76 spent at Amazon could be almost anything (or anythings). Honestly, I look at my credit card statements and even I have trouble figuring out what I spent money on. The data just doesn't seem that interesting.