Earlier quoted context omitted.
Because they are on the hook for fraudulent transactions, until they get to merchant to refund. Otherwise they wouldn't care. Which is why some merchants get effectively blacklisted if they have too many fraudulent transactions
No, I get it. Give me a "Freedom Card" or whatever that generates a one-time use number/cvv combo, backed by cash, that I'm fully responsible for. If I give a guy on the corner $5 cash and he walks off with it, that's between me and him. We don't need to resort to crypto. I don't care if there's a paper trail, I don't need to be anonymous. I just don't want money people to have any say in how people choose to spend t…
This is one of the problems that crypto was attempting to solve (if implemented properly and used correctly). There is a third party(the "network"), but its decentralized and at least for "proper" networks, no one organization has a controlling interest in the network
Now any given miner/producer does not necessarily have to accept any random transaction. In practice however, for mature networks such as Bitcoin there are so many different miners/producers, its unlikely they would all conspire to disallow certain accounts or types of transactions.
Now this is certainly possible for a crypto exchanges and therein lies the rub with cryptos - if you want to get the cryptocoin, you generally have to buy it with good old fashioned hard currency. Conversely if you want to convert the cryptocoin back into hard currency. And exchanges nowadays are facing increasing regulations from governments. Which means practically you are still largely under the thumb of those powerful organizations without some real gymnastics involved, such as trading crypto for cash with a real person in a back alley somewhere, or vice versa