Yea, but as far as I can see, chargeback only applies when there is a dispute, or goods are not as expected etc. I cant see how it would apply in purchasing bitcoins.
There are not-so-virtuous types out there (believe it or not) who make
fraudulent chargeback claims. I think this is one of the reasons the CC companies get so antsy when one tries to purchase anything of real value. They block the payment, then one has to phone the CC issuer to ask their permission to reprocess the payment, then try again with the merchant (arrrgh). This helps protect the CC issuer against "friendly fraud" whereby someone makes a legitimate purchase and pretends someone stole the card before the transaction occurred. If you've explicitly passed the CC identity verification crap
and confirm the transaction, you cannot then turn around and say you didn't authorize it!
Similar applies for PayPal.