That's like saying "100% of USA controlled by one entity" - except that in the US people are stuck with one president for four years no matter what, and when staking users can go stake with someone else at any time at all.
No doubt about that, people are in the dark about effective centralization of PoW and PoS, but PoS makes it easier to move to a new representative. In PoW, if you wanted to be a part of those centralized services with any return at all, you often had to get a spot on a mining farm, which meant you were locked into that place; even if you left, someone else just took your place, so effectively, it was the computational power that was locked in with that specific centralized mining operation. With PoS, there is no such lock-in, and changing the staking destination is a quick affair.
