While there are voluntary shit-ass PMs, you can only afford to be not a shit-ass PM because the org isn’t squeezing you for all it can. Once it does, you’d have to make similar decisions. If you quit because you don’t agree with the way things are going, a compliant shit-ass PM will take your place, or no PM, and the people would end up in the place the parent described.
I guess renting the water supply is cheaper in the short run and more expensive in the long run.