Which means your bank knows if you buy a sex doll, if you have diarrhea, if you are a member of a political party or if you donated to your cult. And I don't b

Which means your bank knows if you buy a sex doll, if you have diarrhea, if you are a member of a political party or if you donated to your cult. And I don't believe in the legal system enough to think that the information is not shared. Also, cash is one of society safety net. You see, nothing is black and white, and society is not perfect. If it can control everything, then the citizen has no margin, no grey zone to try things that the current society consider wrong. And this is a problem, because you can't make society evolve if you can't try what you want to change for first. Cash let a small part of society locally try things that are not (currently considered) right. Without it, you would soon have a static society. Another problem is that, because society is imperfect, it will create rules that in certain situation are bad for the people. Without a way to bypass the system at a local level, you are at the mercy of errors (not even talking about evil doing), with no short term solution. Without cash, if visa or bank x doesn't like you, you are screwed. Without cash, if you are doing something moral but illegal, you are screwed. Without cash, if you are doing something that society consider immoral (ex: going to a gay bar in a repressive country), you are screwed. Yes cash is abused, but a life without cash eventually would derive to something way worse : a rigid society.