To me, the biggest sin of cyberlibertarianism is the assumption that "cyberspace" is de facto another universe, separate from material reality, that doesn't need to be affected by the mundane and vulgar rules of "meatspace." John Barlow refers to "your governments" as if using a computer actually separates him from the state in some meaningful way, as if he has ascended beyond the flesh and now looks down upon the world as a being of pure Mind. But of course, "cyberspace" is just computers, servers, infrastructure using power and resources and thus is inextricably subject to government and systems of law. Zion was never an escape.
So yes, because cyberspace doesn't actually change the rules of the game, we have to play the game, crooked as it is, with the hand we're dealt. The legal pretense of ownership and copyright is all we have. If you want to abandon the idea of "ownership" altogether, then the wealthiest and most powerful still wind up controlling everything by virtue of their wealth and power. What do you suggest?