It sounds great to "invest on the fundamentals", but there doesn't appear to be a way for the average person to even comprehend what "the fundamentals" even are.
But there has to be at least one fundamental: If the company goes bankrupt, the stock is worth nothing. Gamestop is most certainly going to go bankrupt eventually. Their business model doesn't work for today's market.
No one is going to convince me that GameStop has a way to avoid that eventuality.