The problem for GME is that it will crash regardless if there's stock market crash or not. When a market crash happens you're much better off holding value stocks of solid companies.

As of mr. DFV, I'm sure he'd like to close his position at the current price. But my guess is that he prefers to hold for his reputation. Since he already guaranteed more money than he would ever need, it's not a bad decision. The other option is that he believes it's going climb even more, which is possible. But don't assume people hold for any reason other than making money. Once the squeeze is over it will fall like dominoes.