This might be a naive question - but since when are SEPA transfers reversable? (In case that you gave a correct and matching account name + account number.) I never heard nor have seen reversed SEPA transactions so far. Can you maybe elaborate on this?
They're not reversable if you, as the owner of the account being transferred from, gave a correct account number and name. They are reversable with certain restrictions if the original transfer request itself was made fraudulently, even after the funds have supposedly cleared. Mt Gox's problem was that phishers were carrying out fraudulent transfers from other people's accounts to Mt Gox.
Dwolla is aware of it. But if they can just reverse their payment, they have no incentive to do anything about it.
They can't do anything about it. Normally there'd either be a delivery of a product that's traceable or no way for someone to make large amounts of money from this and thus no incentive to do it, but due to the nature of Tradehill's business neither is true.