POW is the exact same unfairness driven by scarcity. The only difference is people buy the same $-value of mining hardware, instead of buying the actual coins of the chain they want to support. You could argue that POW is even more unfair because companies get to decide which pieces of hardware get sold and produced, and they always profit no matter what instead of the people actually contributing to the network.
RE: Is Proof of Stake an Unfair System?