Why do you think that cryptos are a form of manipulation and control when they are de-centralised?
"Decentralization" doesn't mean something isn't capable of being manipulated or controlled.
This idea alone, no matter how many times it's repeated, doesn't make it true.
Cryptocurrency, because there are many forms, has various forms of centralization. Coiners just prefer to call them "decentralized" because they aren't produced by a single country (in an attempt to make them seem like something they aren't). State issued currencies are actually less centralized than cryptos since they are only used and traded in their home countries. Even the dollar, being the reserve currency of the world, isn't used in day to day economic activity in 99% of the transactions that take place in other countries.
The SEC, other entities in the Treasury Department, and states themselves regulate Bitcoin and other cryptos in the United States ALREADY as I'm typing this. Cryptos aren't outside of government regulation or manipulation (no matter how much people want that to be true). The US, or any other country, doesn't need to be able to "print" more Bitcoin to be able to manipulate it and the mere suggestion to the contrary shows a real lack of understanding about currencies and economics in general.
Cryptos, just like anything else (and especially so) are capital in motion. Cryptos have no value unless converted into a currency or goods that are a part of an economy tied to central banking. They are, at best, a 2nd degree of manipulation if a person is claiming that state currencies are manipulation by themselves (which is an entirely different discussion).
The C_A & FBI seizes and holds cryptos (including Bitcoin) to unload when they want to affect various positions in the public. Many other countries do this as well as just a couple examples of how they are manipulated.
Cryptos are manipulated all the time but coiners try to make it seem like the "printing" of currency is the only factor that matters when currencies are much more complex than that. That's not even getting into the fact that claiming Bitcoin is in a limited supply can't be proven for another 100+ years.
Even if Bitcoin were in a limited supply no coiner can explain why that, and the deflation it would bring if it were ever used as the real standard currency for any group or nation, would be a good thing (because it wouldn't be).
Deflation brings economies to their knees and is unsustainable in any economic environment unlike "inflation" which is not only sustainable but when applied in moderation (1-3% annually) is the sign of a healthy economy. No person would argue that a growing economy can survive on the same amount of currency forever and to suggest as much just shows people have no fucking clue what they are talking about. Even the amount of gold in my existence is continually increasing which is what makes that whole idea of "fiat" so comical.
If people don't like the amount of dollars in circulation or how they are backed that's one discussion that I've always enjoyed and supported along with removing The Fed. However, suggesting that Bitcoin, or any crypto, should replace the dollar is fucking insane and unjustifiable especially when Americans have it better than anyone else on earth while living in the most prosperous nation in human history.
The Founders themselves created the Treasury and gave the government (We The People) the right to control our own currency. To argue against The Founders and the sovereignty of We The People because someone thinks they know better and are butt hurt about the amount of currency in circulation or whatever is unamerican, selfish, and greedy.