He is talking about mining bitcoins, not buying bitcoins.
Most bitcoin hash rate comes from places with low energy costs... its just basic economics.
The only reason this arbitrage is present is because the value of bitcoins is higher than the cost to mine them at the moment. Since the capital investment required to setup a (reasonable large)mining farm is rather high, it is unknown if the investment will pay off over the long term. But a lot of people are betting it will.
Most bitcoin hash rate comes from places with low energy costs... its just basic economics.
The only reason this arbitrage is present is because the value of bitcoins is higher than the cost to mine them at the moment. Since the capital investment required to setup a (reasonable large)mining farm is rather high, it is unknown if the investment will pay off over the long term. But a lot of people are betting it will.