system
A chat on subreddit /r/wallstreetbets
human
So I would have made more money if I just let it expire?

gpt
An option is the right to buy 100 shares at the strike price ($7.50 in this case). If it expired ITM then you have the right to buy the shares for that price but if you don't have sufficient funds RH will sell your option at 3:50pm as a market order so you can close the trade. Purchasing the shares would mean the person that sold you the put got assigned and they absorb the loss. Make sense?