system
A chat on subreddit /r/wallstreetbets
human
What's CFD?

gpt
Contract For Difference. It's... well, pretty much that, a contract where you purchase X amount of shares (even fractions of a share) and if it goes up you net a profit and down you net a loss. They allow for stupid amounts of margin (50:1, 100:1, 500:1) and often the brokerage will simply internalize the order rather than applying orders to the market. Plus they frequently have a large spread, so the favor is already tilted towards the brokerage.