They are backed by cex.io which is an exchange that trades GH/s for BTC. They are able to run a pool for 0% fee, along with mining a couple of other altcoins m

They are backed by cex.io which is an exchange that trades GH/s for BTC. They are able to run a pool for 0% fee, along with mining a couple of other altcoins makes them a more profitable pool than others.