Many fear that governments are going to clamp down on cryptocurrency and reign in the threat that it possesses.
To achieve this, they would need global agreement to ban crypto. It would also require enforcement, something that has shown itself to be difficult throughout the decades.
When a significant percentage of the population opts to use something in spite of what the government decides, it is impossible to stop.
The analogy is marijuana in the United States. Even though it was banned for decades, surveys report 90% of the adults at least tried it. This shows there is some disconnect between what the government decides and what people opt for.