a libertarian utopia won’t be possible and some rule of law around content is beneficial for society.

1. There is no utopia. Only fools (including communists, socialists, and capitalists) believe in utopias
2. The absence of rule of law is not a libertarian idea. Quite the contrary. Law predates the state
3. I think you are confusing libertarianism with anarchism. But even with anarchism, most anarchists don't actually suggest no rules(laws). Just no rulers.
4. You are saying the current state of society is a reason why something that doesn't exist would not work. Some logical issues with this statement. What you describe exists now in the current society with very oppressive governments. What kind of totalitarianism would be needed to prevent this use of technology?