Judge for yourself. Look at the price of all coins in the market and the US budget. Of course they can buy all the coats. Manipulate the mining. And in general, create anything.

Therefore, it is necessary as quickly as possible to introduce bitcoin into wide application in business. This will protect the manet market and make the rate more stable. And many other good things will happen. 

I'm not sure there will be a country that can do that. Moreover there will be a significant difference. Some of the supporters of course they will be beside us and for countries that do not support then this is a very bad result. A country should buy a lot of bitcoin and altcoin because they will be responsible for what they do. But I say that in fact money will be hard to accept, it is a consequence to be able to bring in and buy cryptocurrencies for a country.

Unlikely that a government is willing to spend so much of their money attempting to somehow manipulate markets or accumulate coins. Especially because there are so many countries in debt... And there's really no direct advantage in doing such.

I am wondering if your question is could the government buy up all the crypto that is in supply? to control or corner the market?

or

Could they control who can buy crypto?

The first one first?

They could try buying up all the crypto, and on paper it seems the sub $200 billion price might be a drop in the bucket, but I think as soon as somebody went on that kind of a buying run the price would soar. The market would react and the capitalisation would spiral to unimaginable highs. There would also be some hold outs - who under no circumstances would sell, they would do this on a point of principle, and then what would be to stop anyone/everyone starting new currencies to cash in on the bonanza?

The second question, controlling who can buy currencies? this is already partially the case in some countries - but its not fully implementable, because I could sell you some crypto coins over the internet, or in a face to face encounter and who is going to stop that? See Venezuala.

i don't think that the governments will try to take over the cryptorealm because the government has a lot of bigger issues than bitcoin so, acquiring it might a big controversy and also as for us consumers, the it will have negative impact in price

I think they are not interested in buying all coins in the market as some of them have no potential and just a fraud, what they want is the regulation and control of it, they want to strictly prohibit coins that can potentially scam and steal people's money, some of the Government wants it to centralize and manipulate its value and demand to people like bitcoin.

Bitcoin is decentralized and cannot controlled by anyone even the government. The only thing that authorities can do is to support with it,not by making cryptos into down. Even though the government didn't support this, but cryptocurrencies are still exist in the market.

Basically the government can't controlled the growing cyrptocurrenies in the market. Because the government itself has a lot of problems to be solve and more laws to be implied and the government never take a risk of unsure investment.

I do not think that the government will be able to decide on the total purchase of coins for the purpose of control. Bitcoin is not the most stable thing in the world, although it is growing up. In addition, the state has much more important areas of activity. Also, each country has reserves of oil and other minerals, precious metals, real estate, etc., where you can inject public funds.

that much gigantic volume cannot be controlled by any kind of government. that is also against the philosophy of crypto currencies.