.... ah no, this is complete bullshit. People were keeping coinz on finex so they could lease them out for shorting or so they could gamble with 10x leveraged (on margin) trades on sometimes very short terms ... casino speculation aka day-trading.
as far as I can tell returns for lending out btc to traders are really low. the money's in lending out the dollars. you'd have to be dumb to be risking it for those percentages but dumbness is rarely in short supply here.