system
A chat on subreddit /r/wallstreetbets
human
Only problem if youre over leveraged with futures is that in a flash crash you can lose more than you have in your account. 
  
 A problem that you can solve with options as hedges ... :D

gpt
I heard it's also marked to market so you realize gains and losses everyday instead of exercise date or expiry date...So basically if you mess up you need the whole collateral to hold it