just to reflect your attitude, why should we trust them to delete our data? why do we even tolerate a background level of fraud at all?
how about this - I dont use my cards that often - maybe 20 times a week. i'd be much happier if i got a notification through a side channel with a proposed charge and I could click 'yes' or 'no'.
it makes alot more sense to me than having to poll my account to look for potential fraud and argue with the bank about re-issuing a card with a new number.
wouldn't that be simple? i understand that for some usage patterns that would be inconvenient.
the broader point is that I shouldn't need to expose personal information just to buy a tea towel, I shouldn't even have to give you my email address so you can start sending my helpful hints about how awesome your other products are.