No, I don't agree with such statement that, "cryptocurrecy: making money out of air". Nothing good come easily and money making doe not come unawares. Every penny($) earned in crypto economy was born out of a good idea invented some 10 years ego and the technology works so perfectly that people around the globe are now embracing it.
Yes, BTC is volatile, we all are already adware of this, a situation that will always swing either sides basically due to the demand and supply rules; and can not be considered as "making money out of air". This must be outrightly rejected because it is baseless, and was spoken out of hate From those who had probability missed the big party. BTC is hitting the moon no doubt about it, whether "making money on air", or no.