Yes and no:) Currently and generally a single jurisdiction doesn't allow for competing courts. In libertarian land everyone has (or is?) his own "jurisdiction

Yes and no:) Currently and generally a single jurisdiction doesn't allow for competing courts. In libertarian land everyone has (or is?) his own "jurisdiction" for his private property (and there is no public property). All other courts are defined in contracts. Note the latter is the generalization of the former where entering other people's property entails an implicit agreement to the owner's terms (and jurisdiction if you will.) So everyone can define his own abortion/marihuana/uber free zone at will and/or just rule out the public completely. Often there is a misunderstanding that this entails a "free for all" but municipalities in today's sense would still exist and have their own laws / courts and the streets there would probably belong to a company consisting of a number of the municipality's inhabitants. This doesn't mean that there is only one such company, so you can "choose your court" by walking the streets of company A and avoiding the streets of company B. Or you dislike them both and just move to some other town a few kms away.