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RE: Thoughts on Fork 22.5 - The Empire Strikes Back
Like I said, PoW and PoS can be attacked too, but it's very, very difficult, and even if they do, it's very temporary. There's no comparison, it's a totally different thing. Also, with measures like the slashing mechanism in Ethereum's upcoming 2.0 PoS system, it's actually impossible.
In short, what just happened with Steem will be impossible outside of DPoS, at least a chain of Steem's size. Other consensus mechanisms have flaws, but nothing anywhere near as dire as this.
Agree, a big chain like Ethereum with PoS and Slashing is much more secure than a small chain with DPoS like Steem, but there are still take over risks with PoS systems too if an attacker has the majority of stake and nodes. The current attack on DPoS can also be temporary, if the community can find a solution and fork or negotiate out of the situation.