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So in the case of lending/borrowing BTC directly... it will make sense to do it only for long terms contracts, like over 5 years?
I think moreso the opposite, it would only make sense on very short timescales. Long term we expect the BTC price to go up right? So we don't want to be short BTC long term. Even short term is risky haha but some people do make money shorting BTC.