Given the nature of this digital currency, there are always conversations to be heard about not buying Bitcoin, as Bitcoin works outside the traditional banking system, so there are too many opponents to it. However, its design is such that no one can create a particular barrier to buying it. If you have access to the Internet and a Bitcoin wallet, you can invest in buying Bitcoin.
Many countries have struggled to obtain this digital currency. Bolivia, Thailand, Vietnam and Bangladesh, for example, are all trying to obtain Bitcoin. Even more advanced countries such as Russia, Japan, Australia and Venezuela have attempted to legally sell Bitcoin. But it is interesting to note that some countries, such as India and the United States, have not yet taken action in this regard and have not yet defined an official policy on such currencies.
In general, it should be said that bitcoin cannot be an obstacle, and this is one of the advantages of Bitcoin.
This really could not be more wrong.
On surface level, yes, the government can't technically stop you from buying Bitcoin. But who controls the internet? The government. Who gives you internet access? Private corporations that operate within the purview of the government. The government has the power to completely limit Bitcoin by either regulating it into the ground, or taxing it insane rates to the point it doesn't make sense to trade with it. Right now, the countries that ban Bitcoin aren't established enough to have a large effect on the markets, but if China, US, EU were to try and ban it, you can bet they'd have a massive effect.