Because it costs so much electricity, several countries have imposed restriction on mining activity?
who told you that?countries dont care about how much electricity has been spended thru mining,whats important is they pay for what they used,isnt it favorable to any countries in which the volume of elevtricy ed is rising this means the country is more developing..and besides its the miners problem who, he spends more costly electricity .eithr if he can gain or loss its hes prerogative