Use case: shorting a stock without paying borrow fees and without the locate friction. Useful in hard-to-borrow names where short-stock locates are difficult or expensive. The synthetic short position carries the same theoretical risk as a short stock position — unlimited upside loss if the stock rallies.
Practical considerations: the short call has assignment risk, especially around dividend ex-dates on dividend-paying stocks (deep-ITM short calls may be exercised early). The position requires significant margin and is suitable only for traders with the capital and approval level to handle naked short call exposure.