Indonesia mainly runs on thermal power, it is kind of sad that those crypto currencies indirectly encourage making profits out of cheap labor and the planet itself.
source wikipedia: http://en.m.wikipedia.org/wiki/List_of_power_stations_in_Ind...
source wikipedia: http://en.m.wikipedia.org/wiki/List_of_power_stations_in_Ind...
If Indonesia uses thermal power then using the electricity generated from it has little negative environmental impact.
Additionally I'm unclear where anything is "making profits from cheap labor". The miner benefits from the low cost of living in Jakarta, but making that out to be a bad thing is like complaining that housing in Kansas isn't as expensive as New York.
Thermal as in burning fossil fuels, not geothermal.