I believe that all governments ultimately have an incentive to "keep business as usual", democratic ones like oppressive ones. This means protecting large business entities of course, but also smaller ones: if regular people are scammed of their money by possibly foreign actors, it's cash they can't use to pay for local goods anymore and as a result it's a net loss for the domestic economy.

What we are seeing with cryptocurrencies definitely isn't "business as usual". Beyond the obvious financial fraud of Tether that is currently being investigated, Bitcoin mining reactivating coal plants and causing microprocessor shortages, Chia mining ruining SSD faster than we can produce them, and ransomware being exclusively enabled by them all are good reasons for governments to step up like China did recently. And this is completely independent from any power fantasies governments may have.