Maybe don't put libertarians and feudalist together.
I believe it means libertarian in the context of present systems. In their new system, they no longer need to be libertarian. Just absolute ruler. King is even the wrong term.
Dictator
Can't believe they would be publicly calling for a monarchy, and still call themselves libertarian.
Leftist anarchists are acutely aware that power and capital accumulation go hand-in-hand.
Extreme libertarians are perfectly fine with the unfettered accumulation of capital and seemingly ignore that that results in unchecked power. Or they have faith that a “truly” free economy would somehow check itself before becoming effectively neo-feudalistic or dictatorial. As if the lion would fear the zebra.
Leftist-anarchists want to keep power to an absolute minimum. Usually relying on a combination of culture and group action to wield just enough power to prevent the growth of unchecked power in the hands of a few.
In my mind, culture is the key element. The capital-worshipping, me-versus-all culture we live in would fit quite well into extreme-libertarianism and then it would devolve into defacto rule by a few. (As seems to be happening anyways. Because, again, capital accumulates, protects itself and takes power where it can when no one is willing to or allowed to work together to stop it.)
Leftist-anarchism requires a more mature, selfless, introspective, cooperative culture. Anathema to the “United” States of America.
Most anarchists, just like hard-line communists, seem totally opposed to the idea of private capital at all. To me this seems just as bad and unworkable as allowing unchecked use of capital accumulation for political gain.
They are generally not opposed to personal property, especially if the property is actively used.
Extreme libertarians, “anarcho-capitalists”, do not distinguish between productive and nonproductive property. And so they ignore the end result of private ownership and accumulation of the means of production: new rulers in some form.
Opinions on money and currency vary.
Similarly, opinions on wage labor vary, but generally they expect a laborer to receive their full worth, ie wage labor would not see profit extracted from it.