Because it costs so much electricity, several countries have imposed restriction on mining activity?
Restrictions is needed to address abuses and to maximise the responsibility of a miners for the development of one country.. Cryptocurrency mining in majority of country around the world still hanging in thread for any further policies that still need any more regulation..
In a small miner perspective like me,, everything completely fine even the price of mining coin is decreasing.. As long as Im HODLing it this concern wont be a big problem.. Money for those who wait like most holders does in the past..