I am skeptical of cryptocurrency networks in general but one thing that they share is the general 'attack resistance' of trade and markets in that attacking it ruins the value they would seek to steal.
If you try raiding a market the trade will dry up as traders won't want to come where they may be attacked and trading with people who attack traders is bad for business given the precedents it establish for property rights. Essentially even if you could seize it all it would be worth a fraction of the value because nobody wants to give their goods/money to 'dicks who steal stuff from traders' for the same reason you don't go to barbecues with cannibals. This is one way that markets and trade help promote peace - war becomes a losing move and ones who anger others less are better resourced
If they want to take everything by force you need to seize the goods and means of production themselves - which also highlights why communist countries have had terrible economies - in addition to all of the economic fallacies. Expropriation scares people off.
Come to think of it this is something that has bitten Haiti with its history and highlights the amorality of the effect. Slaves suffered under conditions so brutal that the slave population was sustained through importation instead of reproduction, greed and economic forces caused slaves to vastly outnumber the masters, and machetes were indispensable tools for sugar plantations. While their grievance was justified they were pretty much embargoed pariahs as a result.
The point being that these phenomenon aren't moral or immoral in themselves and are something that should be kept in mind by all actors.