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

Freedom of speech does not apply to:

Conspiracy

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.

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Perjury

And much, much more.

Fraud

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False advertising

No freedom is absolute.

Threats of violence

Do you know of a female masseuse that does door-to-door service in Bangalore?

HIPAA violations

Revealing classified information

Trade secrets

What do you think hell is like?

Insurrection

Revenge porn

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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Child pornography

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

Why do you think Islam oppresses women when Christianity clearly does it more?

Terroristic threats

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.