This was probably just a bit or whatever, but I feel like it would be pretty easy for someone who actually thought all hierarchy was involuntary to argue that acting according to biological imperatives (such as the need/desire to engage in kink dynamics like femdom) are not voluntary. We can't choose what sexual orientation we have, either.

Those fundamental desires are imposed upon us by our brain chemistry, whether we want them to be or not. You can consent to who you engage with, but you can't consent to experiencing those needs in the first place.

If you squint hard enough, that's similar logic as when people claim that capitalism is fine because you can "choose" to get a different job.