Or it's not USD that is chargeback, but the nature of digital transaction for the current state. If you go to a store and buy a can of soda with bills and coins, you don't really get a chargeback without handing back the goods.
It just illustrate that online transactions should be chargeback-able to protect consumers from fraud. Bitcoin just doesn't cut it.
But if I want to send money to a family member (as an "online transaction"), and I have concluded that I do not need chargeback protection, why should I have to pay an extra fee to cover all those people who DO need it?
I believe there's a place for non-chargeback online transactions. Just as there's a place for non-chargeback in-person transactions (i.e. CASH).
It just illustrate that online transactions should be chargeback-able to protect consumers from fraud. Bitcoin just doesn't cut it.