Some of these alleged financial groups may be on the hook for possibly BILLIONS of GameStop shares that were borrowed and sold, but never originally purchased. It is speculated they will need to be purchased at some point, although currently, it seems they have an infinite amount of time to purchase them. (Even tho they were sold).
This would be similar to somebody selling a bunch of car titles (but not include the cars), keeping the money, and then be allowed to have an infinite amount of time to actually deliver those cars (and keep all the money in the process).