system
A chat on subreddit /r/wallstreetbets
human
They get to hold $20,000 in cash until the payout. They can earn a risk free rate of 2.4 ish percent holding treasuries and will earn signifcantly more than they would have to pay out even if they do have to pay out

gpt
I'm jot too familiar with laws regarding Casinos and their funds but I'm sure there is something that says they have to keep the cash liquid. Again I'm not really sure though. I know a lot of Casinos hate this type of action as the bettor gets comped and the book really has to take the bet. If they were making a bunch of money off of it I'm sure they would welcome it whenever it happened but that isn't normally the case.