Do people buy real world things with cryptocurrency now? Is this even a requirement? People aren't buying anything with GameStop stock, but it seems to be doing fine.
Those are definitely different things. Owning a GameStop stock gives you a small ownership and right to their profits (in form of dividends) in real money.
Owning a cryptocurrency means nothing if you can't actually use it as a currency in real world.
Yes, dark web markets are booming. dark.fail is a good starting point if you want to explore them.
GameStop won't keep increasing for ten years, like crypto did, without some real world fundamentals.
Even in GME case, you have the short sellers as a backbone for its rise, not just buying and selling for the sake of it. Without the short sellers, GME wouldn't have risen up that much.