Can someone explain to me like I’m 5 why this is a bad idea?

The author has purchased both a call and a put option on SPY, creating a long straddle (or strangle). The author believes that a significant price movement in SPY in either direction will cause one option's value to increase more than the total premium paid for both options, guaranteeing a profit or, at worst, a break-even scenario. This is a flawed strategy based on an incomplete understanding of options trading. The author is attempting a long straddle, a strategy that bets on high volatility. However, they have not accounted for the significant costs of time decay (theta) and potential implied volatility crush (IV crush), which can erode the value of both options simultaneously, leading to a loss even if the price moves. As pointed out by commenters, if SPY trades sideways, both options will expire worthless, resulting in a total loss of the premium paid. The primary risk, and the flaw in the thesis, is that SPY's price does not move enough to overcome the combined premium and time decay of both options. A sideways or low-volatility market will cause both the call and the put to lose value, a concept the author has overlooked. Commenters u/lupindub and u/Slightly-Blasted correctly identify that theta decay and the need for a substantial price move make this a high-risk, low-probability trade, not the "win or break even" situation the author imagines.