Because it costs so much electricity, several countries have imposed restriction on mining activity?
Yep, there are still bitcoin miners, cause if there aint any miners there would be no way for your transactions to be confirmed. If youre a single bitcoin miner I dont know if youre really going to make anything out of it as of now, cause it consumes a lot of power, so by the end of every month you might end up using everything you mined from bitcoin to pay your electricity bills. Best is to just to have a mining farm, but an individual cant do that, its only companies I know that does such. But as for whether there are still miners? Yes there are lots of them.