A country's government can temporarily influence the Bitcoin market if it wants to, but that influence does not last long. Like assuming China has a lot of influence but China has banned Bitcoin several times before but the impact of that ban caused a temporary impact on the market but that impact didn't last long. So the government of a country can't crack down on Bitcoin if it wants to, but it can temporarily create a negative reaction and there can be a kind of crack down in the market.
I also don't think any government can completely eliminate crypto on a global scale. It's very difficult for all governments to agree on that, as crypto is generating revenue for many countries through taxes and promotion.
However, governments can suppress and make it difficult for crypto to develop in that country. China has suppressed crypto, and we haven't seen the development of crypto in that country, although blockchain is being researched and implemented by them. Chinese investors are not benefiting from this suppression, a legal framework accepting crypto is what we can expect in future!
Yes, the government can only ban and cannot eliminate crypto in its country, because even though China bans crypto, many of its citizens still invest and mine. Nothing can stop crypto unless the government turns off the internet connection in the country.
Exacty, Governments can make decisions and implement bans on cryptos but implementing a total ban is almost impossible due to the nature of cryptos. Like China, despite the government banning operations of the devices the citizens are carrying out crypto-related activities secretly or in one way or the other. This is due to the decentralized nature of transactions in the crypto market effective use of the Blockchain technology individual cannot be wholly controlled.
The only other possibility of stopping all crypto activities as we have seen in this paper, is to completely switch off the internet in the country – which is otherwise quite impossible in the long term, especially if it resets the whole economy and social lives. Moreover, experienced crypto users will always look for a way to remain connected to the blockchain network, operational via VPN and other technological connections. However, this phenomenon of innovative growth indicates that even if authorities attempt to regulate and ban crypto, this currency is going to remain present in different countries, including those countries with strict legislation.