Just based on the title, since it's paywalled: Cryptocurrencies are definitely not useless. Most of them just suffer from pretty shitty negatives, like ridicul

Just based on the title, since it's paywalled: Cryptocurrencies are definitely not useless. Most of them just suffer from pretty shitty negatives, like ridiculous distribution of ownership, ridiculous manipulation, shitty security, infeasible settings, ... This includes pretty much all current cryptocurrencies. All it would take for a cryptocurrency (yes, a single per market pretty much, crypto-(euro|dollar|...) to take hold is for the central market to push it and be controllable by them (almost fully). The issue against that is that international laws and treaties prevent it.