See, again, limited understanding here, but it's my understanding the big firms had shorted the stock. GameStop was supposed to die, right? That means they had borrowed someone's stock under the promise they'd give it back later, and were gambling on the fact that the stock would be cheaper when they had to buy it back from the market to return it. What happens when you short a stock and suddenly you can't buy it back at any price? But wait, how did they do this, stocks are a limited thing and they could short something if there wasn't any stock to buy/sell, so there's no way someone could buy up all the stock and leave someone unable to resolve a short unless they were gaming the numbers and that stock didn't exist (stock counterfeiting).... "OY VEY SHUT IT DOWN"
I'm absolutely certain they have taken measures to prevent another Diamond Hands event. I am absolutely certain that did not entail preventing this shit from happening on the backend, just preventing retards on the Internet from making it so hilariously publicly visible. (I'm also absolutely certain outside of the most broad strokes I got this all wrong and someone more skilled at The Bizness is probably twitching in rage as they hit reply this very moment.)