I agree with DarkStar, you are asking for free money at this point, of which almost nobody will give you. You should re-think the terms of your service
Technically he does have greater risk because someone could give him 0.12
BTC of a highly volatile altcoin, and borrow 0.1
BTC against it. If the coin pumps, he repays the loan, paying a sizable amount of interest but profiting much more. If the coin crashes, they could default the loan and ChrisPop would be left with a loss. It actually would work decently as a hedge in theory as you have limited downside (-0.02
BTC) with unlimited upside and a 30 day period to exercise the repayment option.