Earlier quoted context omitted.
Yes, if a bitcoin exchange accepted credit cards, they'd be on the hook for any chargebacks. Hence why most of the existing exchanges want a bank transfer instead. In theory, a bitcoin exchange should have a near-perfect defense against chargebacks for faulty or missing products or similar, by showing via the public block chain that they delivered the purchased product as requested. However, there's no defense agains…
What if the buyer does a reversal of the bank transfer -- usually possible up to 60 days afterward. (I swear I'm not trolling. I'm new to bitcoin exchanges)
Bank wire transfers, though, are unable to be reversed. Its a pity that most US banks charge for them.