system
A chat on subreddit /r/wallstreetbets
human
Straddles/strangles etc don't actually require margin themselves so short answer is because  investment rules are dumb. Long answer is that if you're doing more than buying basic calls and puts you are/should be selling shorts as part of any advanced trading strategy. You can make a straddle by just buying a call and put at the same strike, but you run execution risk if the price moves quick and you don't place them as market orders.

gpt
Thanks