system
A chat on subreddit /r/wallstreetbets
human
Because for whatever reason they decided to tax SPX (and other index options) as 60% long term 40% short term.  
  
 I usually do 0day SPX. So i literally hold them for like an hour or so at most. All gains are taxed 60/40 long/short 
  
 Its just the way it works. Google it if you dont believe me

gpt
Most cash settled index and futures are taxed this way, yay