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Yes, your point is very valid. Steem issues power on base of how much money a person has, that's their proof of stake mechanism and it clearly has too many flaws.

SLATE also utilizes a Proof of Stake system and one of its apps does target digital content; these are similarities it shares with Steemit. However, beyond that, there's a lot of difference, primarily the fact that PoS in SLATE only allows you to become a supernode to sustain the system, and you cannot enforce your will on creators.