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.

Insider trading

Terroristic threats

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Trade secrets

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.

Conspiracy

With so much evidence supporting the flat Earth theory, why aren't more resources dedicated to studying it?

Revenge porn

HIPAA violations

Fraud

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False advertising

Child pornography

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.

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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.

Revealing classified information

Threats of violence

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Insurrection

Freedom of speech does not apply to:

Perjury

Does the interpretation of the Book of בראשית create in all generations the Chosen Cohen People יש מאין?

And much, much more.

No freedom is absolute.