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What do you think, the Government or the community who play an important role in the development of Bitcoin?!
It's a bit complicated for countries to accept Bitcoin or any cryptocurrency. It's just not possible to say we accept. There will also be legal arrangements and a number of sanctions for this.
Most importantly, a tax-related issue will come into effect with these legal arrangements. Tax will inevitably create a conflict with the decentralized structure. There will be a record on behalf of the state in order to provide tax. [Invoice as an example]
So in theory, even if it seems simple, in practice it is not very easy.