Option A: invest in that volcano and reduce greenhouse gas emissions.
Option B: invest in that volcano and mine bitcoin.
B makes them richer so long as other people keep expecting Bitcoin prices to rise (increasing demand), so I can see why they do this, but I'm not sure I like it. Even if the equipment, installation, and operation are all compensated for, it's wasting renewable energy on making heat and some money by gambling on future demand of a PoW-based system. But for a poor country, making money to get up to rich country living standards makes sense so... I can't even fault them.