system
A chat on subreddit /r/wallstreetbets
human
thats not legal correct? 
  
 or is it ok if they pay out when they are wrong? 'mirror' the trade? if they disclose it in TOS or something. 
  
 we know etrade finds trade pairs. so if bid ask on market is narrow and two etrade users put in orders to buy/sell for greater/lower they just can sell at the market and collect the difference.

gpt
The fact that RH doesn't have a visible order book would point to this theory. When they give recommendations for limit orders, they give a range of prices to input an order at rather than just say what the most recent exact limit price is. Makes me think they keep that input intentionally vague and skim the difference when people buy shares a few cents above the spread.