This objection is sometimes raised, that anarcho-capitalism might not work because someone (who is wealthy?) might just try to create their own State, and anarcho-capitalism won't be able to prevent this.
I don't think this is a problem unique to anarcho-capitalism though, currently States are subject to secession or becoming worse, so anarcho-capitalism can't prevent a State from forming much more than the State can prevent being dissolved. There's somewhat of an equal problem, it seems like.
What are your thoughts on this objection that anarcho-capitalism can't work because it will just form into a State or State(s) again?
I agree it's not a problem, just a fact of life. If someone wants to make a "state" on their own property, that's their business. They will further need to convince other people or "states" to recognize them as one, if they so desire.
If they wish to steal land from individuals or force them to pay taxes, that is a violation of the NAP.