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

No freedom is absolute.

Child pornography

Terroristic threats

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HIPAA violations

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.

Threats of violence

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Perjury

And much, much more.

Revenge porn

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Freedom of speech does not apply to:

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.

Fraud

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Trade secrets

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.

Insider trading

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Insurrection

False advertising

Conspiracy

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Revealing classified information

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.