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To expand on what others have written.
The money has already been spent, when the whatevercoin / digital asset was purchased.
Imagine starting from scratch. I make a single shitcoin, I sell it to you for 100,000 national central bank backed currency units. It then is discovered to be worthless (for whatever reason, nobody wants any of it) - you're left with nothing, I'm left with 100,000 CU.
For every BTC that drops to zero, there will be a balancing $100,000 in someone's bank account (except for the coins mined and held by the miners).
Sorry to dredge but cryptocurrency currently has a $3.74 Trillion market capitalization. So supposing BTC goes to $0-$1000, where do you see all that money going?