Sybil attacks can place a fake chain with a lower PoW difficulty rating until a node sees the other chain with the higher difficulty and reorgs.
That is an
objective decision.
You have to buy or steal the PoS coins to stake them?
Their is a cost involved.
Buying empty private keys will be very, very cheap compared to renting hash power.
Also your pretense at how easy it would be is over exaggerated.
Feel free to 51% attack zeitcoin to prove how easy it is for you.
(According to you it is a zero cost attack so nothing is stopping you.)I have no motivation, nor desire to attack your shitcoin, I have better things to do with my time.
What I am saying is if their is a sybil attack involved and your node is being blocked from seeing the true chain,
you can use a block explorer to verify the true chain for PoS or PoW.
That is not only subjective, but is also human intervention. Double systematic failure.