Microsoft and Cisco do exist.
They won't once intellectual property laws are done away with, not in their current forms at least..
Remove the legal system, good luck trying to switch to other networking infrastructures or finding compatible software, when instead of IP laws they simply send their mercenaries to your house for violating their contract agreements and take your shit away.
Contracts don't apply to third parties. I may sign a contract with Microsoft promising not to give away their software but if I do, anyone that receives that software isn't bound by that contract. They can do whatever they want. Once the cat is out of the bag...
In MountainMan's land in AnCapistan, if you don't pay for what you use, I'm going to take it from you, either in the form of forced labor or seizure of assets. You're free to not be here, but if you show up somehow, I'm not giving you a free lunch. Now instead of MountainMan's land, imagine a coalition of property owners defining a common border (as people are wont to do) and establishing a usage fee. Something to cover the cost of using roads, cleaning up after travellers, etc. Oh... look, we have a tax.
Right. I don't expect to get anything for free. If I leave my property, I'll have to abide by the rules of others. That's voluntary which I'm not against. That's not a tax. That's a fee.
In a centralized system, you have a mechanism of mitigating, stopping, or fixing abuses by the evil and greedy. Sure, it's hard, but it's easier than rebuilding a nation from the ground up.
If the good people out number the bad, it's better to keep things decentralized because as soon as you have a single point of failure, it's easier to attack. If the bad people outnumber the good, we're fucked no matter what. See below.
He who has the most resources wins.
That always applies. Do you think you'll be able to repel invaders with a book of laws as if it were the Bible to a vampire? It'll slow down the bullets but it won't stop them. Whoever controls the most resources wins but it doesn't have to be a single person controlling them. I'll pit your single 1000-man army against a thousand 100-man armies any day.