You mean in unregulated centralized exchanges like binance and FTX, whose entire existence depends on the existence of these Ponzis? When they can just press a button, cause a flash spike, and liquidate all of your winning whenever they feel like it?
Yeah, I'm sure that works perfectly. After all, why would they be dishonest?
The volatility of cryptocurrencies makes shorting them risky. Even if the eventual value is zero, they might go up to any arbitrary number between then and now.
Jeez, you must be a very rich man by now, with all the extensive shorting of crypto this amazing early insight must have allowed you to execute.
Congratulations.