Just a quick question. If hashfast converted the btc he received for payment into USD then how is he supposed to pay back the same btc at todays rates. For example, lets say he received 8 million in payments and half of that was Btc, to pay back half of that at todays rates would mean he now owes everyone 40 million in btc.
you have to stop "thinking" in USD. hashfast received BTC and shouldv'e kept those, for refunds. simple as that. they don't care about other currency's value, so we don't as well.