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

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.

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.

Terroristic threats

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Freedom of speech does not apply to:

Trade secrets

Perjury

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Conspiracy

Revenge porn

Threats of violence

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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.

Insurrection

Insider trading

Why are breasts attractive?

HIPAA violations

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.

And much, much more.

Why do gun lovers think their right to own a weapon supercedes everyone else's right to be safe and not be shot?

Revealing classified information

Child pornography

Fraud

How can I easily get rid of my writers block?

False advertising

No freedom is absolute.