And they were correct until Satoshi invented a solution the Byzantine General's problem with proof-of-work.
Non sequitur for me. Crypto-currencies are many things but they won't annul the theories and efforts of Marxists, even with proper anonymity, quite the contrary in fact, as they strive for equality (in the results! "From each according to their ability, to each according to their needs") and total(itarian?) transparency.