What makes you assume they are located in Iceland?
As I said, even if they have the worlds cheapest electricity and have hardware costs below every manufacturers production costs, their contracts are still too low for them to make a profit.
PBmining would have to be most efficient mining operation in existence to be legit.
There are tons of people who would be willing to invest massive amounts of cash in to such an operation but it's never going to happen when PBmining dresses themselves up like a ponzi.
Nobody knows. There is absolutely no public info and much effort has been put in to keeping it as secret as possible.
I can even understand if the CEO wants to remain anonymous, but I cannot come up with a single good reason to implement a coinmixer and hide the mining address.