Selling options premium generates consistent and predictable income. It can be extremely dangerous if you don’t know what you’re doing. I’ve been selling options premiufor years, and have developed hedges to prevent catastrophic losses. I am very comfortable with the concept, but most traders should never attempt this strategy.
Selling 1 naked SPY put is always less risky than owning 100 shares of the underlying. Premium sellers really only get into trouble for 1 reason -- they trade too big.