ManintheField
Banned
Just how radical of an AnCap are we talking here? If there is some (at least nominally) unaffiliated policing body that protects claims to private property, you're probably gonna be able to have some traction wherever Classical Liberalism has taken root; it's basically just the logical extreme of Libertarianism. If there is absolutely no state but economic entities, then yeah, it pretty much is, as others have said, a form of feudalism. Not that it'd be necessarily evil mind you, the corporate entities could potentially care for its employees and clients, but to people of the period it'd just be a relapse into the arbitrary rule they'd try to escape through constitutionalism.
But I mean it's sort of the same problem as all Anarchist movements, how can you keep oppressive structures from forming.
Yeah, this is a slightly different question. I don't think you could actually have successful, total implementation of the ideology simply because I don't think the ideology is workable, for the reasons listed in this post and for other reasons.
But birthing anarcho-capitalism earlier as an ideology and having it pick up steam as a movement over the course of the 19th century? Totally doable. It's just that any attempt to go for full on implementation as a political system is not going to end up like its ATL proponents imagine, similar to the Bolsheviks and their Marxist-Leninism IOTL.