According to some of the analysis, like true Davos-men, anarcho-capitalists don't believe in national borders and the limits on individual liberty those imply. It has been suggested that the logical conclusion of Milei's philosophy will lead him into conflict with, for example, Villaruel, when she discovers that it means a world in which there are no borders, therefore no Argentina, and therefore no military.
(It's an argument I've heard in respect of Milei. It will certainly be interesting to see how far he wants to take things, and what impact that would have on immigration policies.)