This, as usual has veered off course.
When considering the free rider problem as it relates to any kind of protection or surplus from your provision, there is an equilibrium point at which it makes sense for you to let them free ride and everyone is better off. That point is one in which his use of it doesn’t infringe on your use, nor cost you any more than you would pay in his absence.
Free riding is not always bad, it is taking advantage of otherwise wasted utility in many cases. The point at which a free rider imposes on your use becomes coercive on their part and can be directly seen from the side of the provider.
So I see no real problem in a libertarian or anarchist community (however you want to define that) with free riders so long as they are within those natural equilibrium points.