>Biggest problem about PoW coins, and that's something that everybody working on it knows, or should know, is that the need of power is steadily bigger each yea

>Biggest problem about PoW coins, and that's something that everybody working on it knows, or should know, is that the need of power is steadily bigger each year. They don't really require more power, they are just getting more valuable so it's been profitable for more people to increase their mining investments. The limit is that they are not infinitely valuable, and if anything mining rewards are decreasing.