I think focusing on how it hurt GameStop isn’t the right perspective here. I think it’s more about how greedy and over-leveraged the short holders were. When average Joe goes crazy over-leveraged, the entire world says “well duhh, you took a risk and now you have to pay.” But when a hedge fund does it, they get to just make a call to turn the market off for a few hours and try to bail out their shorts? The hypocrisy is stunning.
"Over leveraged" typically means you traded too much on credit in proportion to how much collateral you have, not that the trade is risky. A very large short position is reasonable for a company that is likely to go out of business.
I understand what over leveraged means. This was /also/ an incredibly risky short to start. I’m not convinced that GameStop was ready to go out of business. Struggling, sure, pandemic and all that, and that would justify a put position, but the market also reacted exactly how it’s allowed to and called out a short positions bluff.