If freedom of speech is absolute, how come it's not applied for private spaces and for the Internet?

You have freedom of speech. If I loan you my computer, I can tell you not to use it for certain things, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

No freedom is absolute.

Revealing classified information

How common is it for siblings to fight over their parents' inheritance money? What is the best way to handle this type of situation?

Insider trading

Fraud

Terroristic threats

Why are people so terrified or bothered that a person has original creative ideas, hobbies or unique interests?

Threats of violence

Revenge porn

False advertising

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If you’re wondering why free speech doesn’t apply to the internet, it’s because you have no right to use other people’s stuff for free.

You have freedom to travel. If I loan you my car, I can tell you not to take it out of town, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Perjury

What would happen if the Soviet Union had simply annexed Manchuria after World War 2 or kept it independent as a puppet state allied them and separate from China as China was too weak too oppose it anyway?

Freedom of speech does not apply to:

Insurrection

HIPAA violations

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Conspiracy

And much, much more.

Trade secrets

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That’s what it is. You have no right to use other people’s stuff. If people let you use their stuff, they can tell you how you can use it, and they can tell you to stop using it any time they want.

Child pornography