Ok, let's imagine property rights are gone. Now it's impossible to build a fiber line without also employing an armed guard of that line. Sure, the open market allows for anyone to build out their lines where ever they like, but since we've eliminated all property rights and laws it means the most natural thing to do to your competition is sabotage.

That means if you are a new comer, you have to employ significant military strength to guard and defend your line going in. Otherwise, existing powers will simply stomp it out as soon as they get a whiff that someone is trying to compete with them. That, or they'll simply take your line by force.

That is probably the most difficult form of entry because it requires someone to be independently very wealthy before they could dream of putting in new infrastructure and it requires them to enforce their own property rights since there's no government doing that.

Are you an anarco-communist by chance? That's about the only group I'm aware of that would advocate for the complete elimination of property rights, but they also usually don't advocate for a "free market".