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

No freedom is absolute.

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.

Freedom of speech does not apply to:

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Revenge porn

Insurrection

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.

What does K mean in Vietnamese?

Fraud

Insider trading

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.

Do you wear tights for warmth or to make your legs look better?

Trade secrets

Child pornography

Perjury

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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.

And much, much more.

Terroristic threats

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Conspiracy

Revealing classified information

HIPAA violations

Time (physics): Who started counting our current time or is it just "set" by some scientific measure?

Threats of violence

False advertising