sustainability
nothing to do with crypto is in any way sustainable in a large scale. and a large scale is needed for a real world application like money.
mining on mobile phones
if it can be done on mobile phones, it is worthless. literally. crypto is essentially telling people with a proof how much energy you wasted. and exactly that. nothing more. you proove that you have calculated something difficult. and that means energy costs. you do not have that power on mobile.
Cryptos have the potential to bring financial liberation to all of humanity
no, it makes us dependent on specific hardware and whoever has the most calculating power. and it does waste a huge lot of energy. not in potential. in the real world. crypto does not scale up and is essentially a huge pyramid scam. the first ones to "mine" have the most out of it, breaking the system down when they leave the system and cash out.