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They could and can. The problem with both PoW and PoS is concentration of consensus/trust over time I think. There are models I've seen that break that up somewhat in PoW and potentially other forms by relying on something that is hard to concentrate (e.g. the market for consumer grade CPU's, social networks, etc). I would like something that anyone can run, but has some natural barrier that prevents it from being centralised.



That's proof of stake. Look at Cardano and Tezos.




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