A totally decentralized cryptocurrency bypasses government control...or any specific government’s survival.
There are financial backers such as startups that hold and use bitcoin and other CCs in their business plan. They have to make it work or their business plan fails. Of course you could argue that they are part of a pyramid. But they can infuse real money into the pyramid where they need to.
The biggest problem with CC's is that very few people use them for commerce as designed. Without a network of users they will wither away except for the blockchain apps.