But to get to it, you must brave this thread:
A cheap BTC borrow + cost of hedging = BTC absolute cost. USD can be lent quite cheaply also, but usually comes at higher rates. In USD you stick to safe stuff, in BTC you risk under-performing selling calls.
BTC is more flexible to owe.
1 ) Neg nom. rates, any inflation kills real yield.
3) Stagflation, BTC rates stay cheaper.