They're Afraid Of Losing Central Banking Control
>Cryptocurrencies may contribute to monetary and financial instability, especially if they were to spawn a large and unregulated financial system that lacks investor protection,” he said.

Translation - Countries will be sovereign over their own money supply, which means their citizens will be sovereign over their own money supply. Unregulated under the control of the Globalist banking system. Each citizens will act as their own blockchain bank, a node in the system. Has the banking system EVER protected the investor? Never. They always drained wealth from those who saved, invested, and gave to heirs. They don't want to lose insider control.
Bring down the entire corrupt temple.

https://www.cnbc.com/2021/10/13/cryptocurrencies-could-lead-to-financial-instability-author-warns.html