Proof of stake, while better for the environment compared to electricity-guzzling proof of work, actually shift the power of consensus to capital owners. In proof of work, any bloke with some computing power can participate in the swarm even if they don't own any crypto. In proof of stake, only those who own some crypto can participate in the swarm, and those who own more have more say.

You can say that proof of works also requires capital to buy computing power, but with the shift to proof of stake, the bar to participate has been raised. If can't just use a spare computer to join now, you actually need some capital to buy some stake before you can participate. It's a big boy club now, a tool to help the rich get richer.