The government may try to block the access of buying and selling crypto but it may not work for them completely because this is not the first time that the government have been trying frustrate people from using cryptocurrency but still people still try their best to use cryptocurrency even with all restrictions from the government. Their is nothing the government will do that will totally shutdown and make people from using cryptocurrency.
The US government doesn't care what you do until you convert your asset into
US dollars. This is true for stocks as well: you aren't taxed until you sell.
And while I can't speak for other governments across the world, the US government has done absolutely nothing to restrict trading in Bitcoin or other cryptos (unless you call going after fraudsters "restricting" it, but a safe environment actually
encourages trading).