system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we continue using the existing credit card technology over all these years despite them being so prone to digital theft and insecure?

Some say that chip based cards offer improved security, but finally everything ends to the 16 digit number, the 3or4 digit CVV number and the expiry date. And as we have seen in the case of wikileaks, the limited number of companies like Visa, MasterCard that control payments can also force a financial blockade. So why do we still employ the credit card instead of using a password based method or a real time payment approval technique or something. I don't want to use these insecure credit cards, but people tell me that my credit score will not improve unless I start using a credit card.
gpt
1. From a consumer perspective, credit cards are way more secure than cash. If someone steals your credit card (or credit card data), in the US, you are liable for at most $50 in charges, and all of the major credit card companies will even cover that for you. So sure, it's insecure from a technical perspective. But as long as you check your statement for unauthorized charges every month, you don't have to care about that. 

2. There has to be something connecting the merchant to the bank that has the money. Right now, a merchant just needs to accept Visa and Mastercard plus Discover and American Express (which run their own banks) and they can accept payments from pretty much every bank in the country. Get rid of that and each merchant would need to negotiate with each bank independently. Which is fine for Bank of America, Chase, HSBC, Deutche Bank, and maybe a few others, but smaller banks and credit unions are out of luck unless they form a consortium that would be jointly accepted (which is what happened originally when Barclaycard, BankAmericard, Chargex, and a few others combined to form Visa). We could switch to a more secure system (and we are starting to, with payment platforms like Apple Pay and Android Pay), but it wouldn't get rid of the need for someone to handle connecting a large number of merchants to a large number of banks.

3. Your credit score will not improve until you take out a loan and pay it off on time- that's really the best way for lenders to see that you're good for the money. And the best way to take out a large number of small loans and pay them off on time is to use a credit card.