This was answered in the comments of the link sent previously, but basically: it's gone to a public blockchain address, of which everyone knows the public key but only its owner knows the private one. Also, the blockchain is pseudonymous, so nobody knows who the owner of the address is.
Therefore, everyone knows where the ether are, but only its owner can touch it. He can use them as if they were legitimately obtained (they are, depending on perspective) and go to an exchange to buy dollars (or euros or whatever), or exchange them with other addresses for goods and services.
Anyone will be able to audit these movements of money (at least the ones that stay inside the ether blockchain), although there exist some cryptocurrency laundering schemes.