Basically, an army of Redditors “yolo’d” their $1000 accounts not really caring if they lost it all, and in the process brought down giant over-leveraged hedge funds that were betting on GameStop to close and lay off all of their employees. "Together ape strong"
There’s more to it than that. GameStop added the founder of http://Chewy.com to their board and he bought a big stake in the company. A lot of people genuinely thought GameStop was a good long-term stock to buy, and that was part of what started the whole thing.
Now if you turn on CNBC or listen to market analysts, they're all villainizing the Redditors and accusing them or market manipulation. Basically their rich buddies lost their shirts and they're pissed about it.
Everything they did was on a wide open public forum, which is more than you can say for the board rooms that these funds operate in.