Why bitcoin is not supported in some country?

[Rojibdx999]

I have heard that bitcoin is not supported in some countries. But why ? Is it because bitcoin is risky ? Some countries even declare 6 months jail if her people use bitcoin. Is it fair ? I mined few cryptos and have left mining. It was fun and challenging too. But I never got any clear answer. What does my gpu actually do ? I pay electric bill, my room temperature goes high and I get paid. With actually no skill on pc hardware and software. Whole thing is still pretty unclear to me
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