FTX is considering a feature where you can decide what currency you're paid PnL in.
Say you choose BTC. You make $5, and it's paid out in BTC. Then markets move and you lose $5.
Do you want to turn that BTC back into USD to pay the $5, or to end up with negative $5 and BTC?
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Do negative USD balances get charged interest?
If not, it should be objectively favorable to take on negative USD balance. If you don't want the BTC exposure, you can get paid to short futures (assuming contango exists)
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right now it's 10bps/day, possible this could become a floating rate based on a margin trading orderbook at some point in the future