Summary: Robinhood's margin system is completely broken and allows for practically infinite leverage. One guy leveraged up to 1'279'550 USD on a 4'000 USD deposit.

Current "leaderboard":

https://www.reddit.com/r/wallstreetbets/comments/drt5tr/guh_...

And an outbreak of memes on Reddit:

https://www.reddit.com/r/wallstreetbets/comments/dr4iem/cont...

https://www.reddit.com/r/wallstreetbets/comments/drxcpw/this...

https://www.reddit.com/r/wallstreetbets/comments/drsxau/the_...

https://www.reddit.com/r/wallstreetbets/comments/dr3eki/say_...

https://www.reddit.com/r/wallstreetbets/comments/dpwa5v/in_l...

People wondering what is Robinhood even doing, and that it's in violation of the federal law:

https://www.reddit.com/r/wallstreetbets/comments/drmr6y/how_...

https://www.reddit.com/r/wallstreetbets/comments/drn8gf/this...

https://www.reddit.com/r/wallstreetbets/comments/dr6gus/robi...