That still sounds like what we have now or have already had in the past on our road to now. Company, democratic government or dictator warlord they all represent a controlling entity empowered by use of violence if necessary.
How is a private business paid for by the community different from an elected government taxing the community? What is to stop the natural tendency of corporate monopolization without an overarching regulatory framework to monitor it?
A police officer now does his job even when a law is not acceptable to the community. It's his job and he's getting paid whether the community likes it or not because the government forces you to pay for their services. If there were no central force of power then no one could force you to pay for their services. If a security company is patrolling your streets without a government they aren't going to do it for free. If they can't force you to pay them they must uphold the contract that you have signed authorizing them to protect your property. If they don't you wouldn't have to pay them. If they overstep their boundaries you don't have to pay them. You can actually hold them accountable and have an officer fired and black listed for breaking contract. If the company doesn't out a corrupted worker they all lose a contract. If they don't protect you when they should the same goes. If my internet was always down I would stop paying the provider and find a company that would keep my internet active. Same with services you see in the government now if they were made private. This causes competition which means you get better services, when you aren't forced to pay they have to give you a reason to want to. It is very similar to what we have now, basically the same exact thing. But when the government owns something you will pay for it. When private interests own it they must sell it to you which gives you a choice and without freedom of choice you are a slave.