Why is hn so negatively biased towards blockchain Icos ethereum BTC?

Why is the hn group so negatively biased towards blockchain technology Icos ethereum BTC and other cryptohacks?

Is there a FOMO or is this based on lack of technical merits, or is it the intensive CPU requirements and green house emissions as a result of ETH BTC and other GPU/CPU intensive crytocurrencies

What makes the ETH BTC Blockchain so inefficient and so harsh on the environment Is there an alternative why are these block chains design to be so power and CPU and GPU hungry ?