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:

Child pornography

And much, much more.

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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.

Insurrection

False advertising

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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

HIPAA violations

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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.

Terroristic threats

No freedom is absolute.

Two of my family members have recently converted to Islam and have brought shame on my family. How do I get them back into the fold of Hinduism?

Trade secrets

Insider trading

Revealing classified information

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Fraud

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.

Revenge porn

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Threats of violence

Perjury